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Used to count, measure, and label
A number is a mathematical object used to count, measure, and label. The most basic examples are the natural numbers: 1, 2, 3, 4, 5, and so forth. Individual
Number
Branch of pure mathematics
Number theory is a branch of mathematics devoted primarily to the study of the integers and arithmetic functions. Number theorists study prime numbers
Number_theory
Natural number
number smallest four digit eban number the sum of all the nban numbers (sequence A008537 in the OEIS) 2001 – sphenic number 2002 = Palindromic number
2000_(number)
Number divisible only by 1 and itself
A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that
Prime_number
Quotient of two integers
In mathematics, a rational number is a number that can be expressed as the quotient or fraction p q {\displaystyle {\tfrac {p}{q}}} of two integers
Rational_number
Natural number
the natural number following 19 and preceding 21. A group of twenty units is sometimes referred to as a score. Twenty is a composite number. It is also
20_(number)
Ratio of inertial to viscous forces acting on a liquid
In fluid dynamics, the Reynolds number (Re) is a dimensionless quantity that helps predict fluid flow patterns in different situations by measuring the
Reynolds_number
Denormalized floating-point numbers near zero
floating-point arithmetic. Any non-zero number with magnitude smaller than the smallest positive normal number is subnormal, while denormal can also refer
Subnormal_number
Number used for counting
natural-number results: subtracting a larger natural number from a smaller one results in a negative number and dividing one natural number by another
Natural_number
Natural number
natural number following 66 and preceding 68. 67 is the 19th prime number, a Chen prime, an irregular prime, a lucky prime, a Heegner number, a super-prime
67_(number)
in Wiktionary, the free dictionary. 1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it
1000_(number)
Number with a real and an imaginary part
In mathematics, a complex number is an element of a number system that extends the real numbers with a specific element denoted i, called the imaginary
Complex_number
Natural number
59 (fifty-nine) is the natural number following 58 and preceding 60. 59 is the 17th prime number, and 7th super-prime. It is also a good prime, a Higgs
59_(number)
Number representing illegal information
An illegal number is a number that represents information which is illegal to possess, utter, propagate, or otherwise transmit in some legal jurisdiction
Illegal_number
Class of integer
In mathematics, the nth taxicab number, typically denoted Ta(n) or Taxicab(n), is defined as the smallest integer that can be expressed as a sum of two
Taxicab_number
Degrees of separation from Paul Erdős
The Erdős number (Hungarian: [ˈɛrdøːʃ]) describes the "collaborative distance" between mathematician Paul Erdős and another person, measured by joint authorship
Erdős_number
Number representing a continuous quantity
In mathematics, a real number is a number that can be used to measure a continuous one-dimensional quantity such as a length, duration or temperature.
Real_number
Sequence of digits assigned to a telephone subscription
A telephone number is the address of a telecommunication endpoint, such as a telephone, in a telephone network, such as the public switched telephone network
Telephone_number
Natural number
natural number following 41 and preceding 43. 42 is a pronic number, an abundant number as well as a highly abundant number, a sphenic number, a practical
42_(number)
Topics referred to by the same term
Look up number one or numero uno in Wiktionary, the free dictionary. Number One most commonly refers to: 1, the number, numeral, and glyph Number one (record
Number_One
Suggested cognitive limit important in sociology and anthropology
Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an
Dunbar's_number
Unique numeric book identifier since 1970
The International Standard Book Number (ISBN) is a numeric commercial book identifier that is intended to be unique. Publishers purchase or receive ISBNs
ISBN
Number expressed in the base-2 numeral system
A binary number is a number expressed in the base-2 numeral system or binary numeral system, a method for representing numbers that uses only two symbols
Binary_number
Natural number
base 10, it is a Harshad number. It is also the first number to be the square of a sphenic number. 900 is also: In Greek number symbols, the sign Sampi
900_(number)
Natural number between 89 and 91
90 (ninety) is the natural number following 89 and preceding 91. Look up ninety in Wiktionary, the free dictionary. In the English language, the numbers
90_(number)
Natural number
natural number following 72 and preceding 74. It is a prime number. 73 is a prime number, a twin prime (with 71), a Pierpont prime, and a star number. 73
73_(number)
This is a list of languages by total number of speakers. It is difficult to define what constitutes a language as opposed to a dialect. For example, while
List of languages by total number of speakers
List_of_languages_by_total_number_of_speakers
Natural number
the natural number following 599 and preceding 601. Six hundred is a composite number, an abundant number, a pronic number, a Harshad number and a largely
600_(number)
Natural number
500 (five hundred) is the natural number following 499 and preceding 501. 500 = 22 × 53. It is an Achilles number, meaning that it is divisible by the
500_(number)
International ship identification number
The IMO number of the International Maritime Organization is a generic term with two distinct applications: the IMO ship identification number is a unique
IMO_number
Serial number used to identify a periodical publication
An International Standard Serial Number (ISSN) is an eight-digit code to uniquely identify a periodical publication (periodical), such as a magazine. The
ISSN
Use of grammar in a language to express number
In linguistics, grammatical number is a feature, in many languages, of nouns, pronouns, adjectives and verb agreement that expresses count distinctions
Grammatical_number
Natural number
3-smooth number (210×3) 3075 – nonagonal number 3078 – 18th pentagonal pyramidal number 3080 – pronic number 3081 – triangular number, 497th sphenic number 3087
3000_(number)
Notation for conserved quantities in physics and chemistry
corresponding observable commutes with the Hamiltonian of the system, the quantum number is said to be "good", and acts as a constant of motion in the quantum dynamics
Quantum_number
Natural number
natural number following 299 and preceding 301. 300 is a composite number and the 24th triangular number. It is also a second hexagonal number. 301 is
300_(number)
Large number coined by Ronald Graham
Graham's number is an immense number that arose as an upper bound on the answer of a problem in the mathematical field of Ramsey theory. It is much larger
Graham's_number
Measure of lens speed
An f-number is a measure of the light-gathering ability of an optical system such as a camera lens. It is defined as the ratio of the system's focal length
F-number
Natural number
number following 799 and preceding 801. It is the sum of four consecutive primes (193 + 197 + 199 + 211). It is a Harshad number, an Achilles number and
800_(number)
Upper bound on a graph's Shannon capacity
In graph theory, the Lovász number of a graph is a real number that is an upper bound on the Shannon capacity of the graph. It is also known as Lovász
Lovász_number
DEA-issued identifier for drug prescribers in the United States
A DEA number (DEA Registration Number) is an identifier assigned to a health care provider (such as a physician, physician assistant, nurse practitioner
DEA_number
Topics referred to by the same term
Look up number two in Wiktionary, the free dictionary. Number Two, No. 2, or similar may refer to: No. 2 (film), a 2006 New Zealand film No. 2: Original
Number_Two
Natural number
700 (seven hundred) is the natural number following 699 and preceding 701. It is a composite number and the sum of four consecutive primes (167 + 173 +
700_(number)
Natural number
57 (fifty-seven) is the natural number following 56 and preceding 58. It is a composite number. 57 has prime factorization 3 ⋅ 19 {\displaystyle 3\cdot
57_(number)
Natural number
30 (thirty) is the natural number following 29 and preceding 31. 30 is an even, composite, a pronic number, and a primorial. The SI prefix for 1030 is
30_(number)
Class of irrational numbers
In number theory, a Liouville number is a real number x {\displaystyle x} with the property that, for every positive integer n {\displaystyle n} , there
Liouville_number
Topics referred to by the same term
Number nine may refer to: 9 (number), natural number Number Nine, Arkansas, a community in the United States Nine (Sault album), a 2021 album by British
Number_nine
Natural number
(thirty-three) is the natural number following 32 and preceding 34. 33 is a composite number. 33 was the second to last number less than 100 whose representation
33_(number)
Nondimensional heat transfer coefficient
Nusselt number is a nondimensionalization of the convective heat transfer coefficient. Like the heat transfer coefficient, the Nusselt number may be defined
Nusselt_number
Naval ship identifier in Europe
Commonwealth of Nations, ships are identified by pennant number (an internationalisation of pendant number, which it was called before 1948). Historically, naval
Pennant_number
Natural number
43 (forty-three) is the natural number following 42 and preceding 44. 43 is a prime number, and a twin prime of 41. 43 is the smallest prime that is not
43_(number)
Topics referred to by the same term
Number 13 can refer to: 13 (number) Number 13 (comics) a comic strip in The Beano Number 13 (1922 film), a film by Alfred Hitchcock and starring Ernest
Number_13
Dimensionless quantity in fluid dynamics
The Mach number (M or Ma), often only Mach (/mɑːk/; German: [max]), is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity
Mach_number
Dimensionless quantity associated with free convection of a fluid
In fluid mechanics, the Rayleigh number (Ra, after Lord Rayleigh) for a fluid is a dimensionless number associated with buoyancy-driven flow, also known
Rayleigh_number
Natural number
15 (fifteen) is the natural number following 14 and preceding 16. 15 is the eighth composite number and the sixth semiprime and the first odd and fourth
15_(number)
Dimensionless ratio of viscous to Coriolis forces
The Ekman number (Ek) is a dimensionless number used in fluid dynamics to describe the ratio of viscous forces to Coriolis forces. It is frequently used
Ekman_number
Natural number
38 (thirty-eight) is the natural number following 37 and preceding 39. 38! − 1 is the 16th factorial prime. There is no answer to the equation φ(x) = 38
38_(number)
Typographic symbol (#)
The symbol # is known as the number sign, hash, and the pound sign and has a variety of other names. The symbol has historically been used for a wide range
Number_sign
Topics referred to by the same term
Look up number in Wiktionary, the free dictionary. A number describes quantity and assesses multitude. Number, numbers, or The Number may also refer to:
Number_(disambiguation)
the Beale number where a larger number indicates higher performance; however, the West number includes temperature compensation. The West number is often
West_number
Figurate number
The triangular lattice representing the n {\displaystyle n} th triangular number contains n {\displaystyle n} rows: the first row contains one point, the
Triangular_number
Dimensionless parameter in fluid mechanics
The Hartmann number (Ha) is the ratio of electromagnetic force to the viscous force, first introduced by Julius Hartmann (1881 – 1951) of Denmark. It is
Hartmann_number
In mathematics, a non-algebraic number
In mathematics, a transcendental number is a real or complex number that is not algebraic: that is, not the root of a non-zero polynomial with integer
Transcendental_number
Topics referred to by the same term
aircraft registration number (civil aviation) United States military aircraft serials Vehicle Identification Number Hull number Pennant number Tail code, which
Tail_number
Number of protons found in the nucleus of an atom
The atomic number or nuclear charge number (symbol Z, from the German Zahl, "number") of a chemical element is the charge number of its atomic nucleus
Atomic_number
Natural number
25 (twenty-five) is the natural number following 24 and preceding 26. It is a square number, being 52. 25 is also the smallest square that is also a sum
25_(number)
Natural number
89 (eighty-nine) is the natural number following 88 and preceding 90. 89 is: the 24th prime number, following 83 and preceding 97. a Chen prime. a Pythagorean
89_(number)
Rational number sequence
the second kind Bernoulli umbra Bell number Euler number Genocchi number Kummer's congruences Poly-Bernoulli number Hurwitz zeta function Euler summation
Bernoulli_number
Natural number
82 (eighty-two) is the natural number following 81 and preceding 83 and 84. 82 is: the twenty-seventh semiprime and the thirteenth of the form (2.q). with
82_(number)
Topics referred to by the same term
Number Four may refer to: 4 (number), a number, numeral, and glyph A hamlet in the town of Watson, New York #4, the pseudonym of American musician Jim
Number_Four
Dimensionless quantity; ratio of a fluid's buoyancy to viscosity
(especially fluid thermodynamics), the Grashof number (Gr, after Franz Grashof) is a dimensionless number which approximates the ratio of the buoyancy to
Grashof_number
Natural number
natural number following 87 and preceding 89. 88 is: a refactorable number. a primitive semiperfect number. an untouchable number. a hexadecagonal number. an
88_(number)
Natural number
6000 (six thousand) is the natural number following 5999 and preceding 6001. 6028 – centered heptagonal number 6037 – super-prime, prime of the form 2p-1
6000_(number)
Class of extensions of the real numbers
In abstract algebra, the superreal numbers are a class of extensions of the real numbers, introduced by H. Garth Dales and W. Hugh Woodin as a generalization
Superreal_number
Test for alpha-amylase activity in flour
The falling number (FN), also referred to as the Hagberg number or Hagberg–Perten number, is the internationally standardized (ICC 107/1, ISO 3093-2004
Falling_number
Natural number
(one hundred [and] fifty-seven) is the number following 156 and preceding 158. 157 is: the 37th prime number. The next prime is 163 and the previous
157_(number)
Topics referred to by the same term
Look up number ones in Wiktionary, the free dictionary. Number 1s, #1s or Number Ones may refer to: A type of greatest hits album in which all or most
Number_1s
Topics referred to by the same term
Number Eight may refer to: 8 (number), the natural number 8 (J.J. Cale album) by the American singer-songwriter and musician Number 8, Pershore, community
Number_Eight
Brazilian taxpayer register
The CPF number (Brazilian Portuguese: [ˌsepeˈɛfi]; short for Cadastro de Pessoas Físicas, 'Physical Persons Register') is the Brazilian individual taxpayer
CPF_number
Solution to x*x + y*y + z*z = 3xyz
A Markov number or Markoff number is a positive integer x, y or z that is part of a solution to the Markov Diophantine equation x 2 + y 2 + z 2 = 3 x y
Markov_number
Ship identifier number assigned to merchant ships
required to carve the official number on the main beam; the system was controlled by the Bureau of Statistics. IMO number Hull number Merchant Shipping Act 1854
Official_number
Numbers obtained by adding the two previous ones
month, the number of pairs of rabbits is equal to the number of mature pairs (that is, the number of pairs in month n – 2) plus the number of pairs alive
Fibonacci_sequence
Topics referred to by the same term
Look up magic number in Wiktionary, the free dictionary. Magic number may refer to: Magic number (chemistry), number of atoms or molecules forming an exceptionally
Magic_number
Ratio of a fluid's kinematic viscosity to mass diffusivity
In fluid dynamics, the Schmidt number (denoted Sc) of a fluid is a dimensionless number defined as the ratio of momentum diffusivity (kinematic viscosity)
Schmidt_number
Natural number
[and] sixty-six or triple six) is the natural number following 665 and preceding 667. It is a composite number. In Christianity, 666 is referred to in most
666_(number)
Natural number
(seventy) is the natural number following 69 and preceding 71. 70 is a composite number, an Erdős–Woods number, a Pell number, a central binomial coefficient
70_(number)
(MAP) 241 INAP 232 CNAM (Calling Name) 247 LNP 248 800 number translation (AIN0.1) 254 800 number translation (TCAP) CAP SCCP SSN reallocation (PDF) 3GPP
Subsystem_number
Quantity in fluid dynamics
In fluid dynamics, the Taylor number (Ta) is a dimensionless quantity that characterizes the importance of centrifugal "forces" or so-called inertial forces
Taylor_number
Topics referred to by the same term
Number Six (The Prisoner), the protagonist of the TV series The Prisoner Number Six (Battlestar Galactica), a Cylon model in the reimagined TV series
Number_Six
Square root of a non-positive real number
imaginary number is the product of a real number and the imaginary unit i, which is defined by its property i2 = −1. The square of an imaginary number bi is
Imaginary_number
Natural number
118 (one hundred [and] eighteen) is the natural number following 117 and preceding 119. There is no solution to the equation φ(x) = 118, making 118 a nontotient
118_(number)
Number
0 (zero, /ˈziː.roʊ/) is a number representing an empty quantity. Adding (or subtracting) 0 to any number leaves that number unchanged; in mathematical
0
Natural number
natural number following 399 and preceding 401. A circle is divided into 400 grads. The number 400 equals 1111 in base 7. 401 is the 79th prime number. It
400_(number)
Number that remains the same when its digits are reversed
A palindromic number (also known as a numeral palindrome or a numeric palindrome) is a number (such as 16361) that remains the same when its digits are
Palindromic_number
In chemistry, a contact number (CN) is a simple solvent exposure measure that measures residue burial in proteins. The definition of CN varies between
Contact_number
Number, approximately 3.14
The number π (/paɪ/ ; spelled out as pi) is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its
Pi
Natural number
odd, composite number. It is also an extravagant number, a lucky number, a polite number, and a deficient number. 777 is a congruent number, as it is possible
777_(number)
Topics referred to by the same term
Look up number five in Wiktionary, the free dictionary. Number Five may refer to: Chanel No. 5, a 1921 perfume, one of the best known in the world Craig
Number_Five
Natural number
(one hundred [and] nine) is the natural number following 108 and preceding 110. 109 is the 29th prime number. As 29 is itself prime, 109 is the tenth
109_(number)
Natural number
11 (eleven) is the natural number following 10 and preceding 12. It is the smallest number whose name in English has three syllables. "Eleven" derives
11_(number)
Airline code for a journey between multiple points
flight number or flight designator is a code for an airline service consisting of a two-character airline designator and a 1 to 4 digit number. For example
Flight_number
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