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34 relations: Alternating factorial, Bell number, Carol number, Catalan number, Chen prime, Colossally abundant number, Cousin prime, Factorial prime, Fibonacci number, Fibonacci prime, Harmonic series (mathematics), Kaprekar's routine, Kynea number, Magic square, Motzkin number, Myriad, Natural number, Pandigital number, Pólya conjecture, Pell number, Polydivisible number, Prime number, Repdigit, Repunit, Safe prime, Scientific notation, Self-descriptive number, Smooth number, Social Security number, Sophie Germain prime, Superior highly composite number, Tetration, Wagstaff prime, Wedderburn–Etherington number.
Alternating factorial
In mathematics, an alternating factorial is the absolute value of the alternating sum of the first n factorials of positive integers.
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Bell number
In combinatorial mathematics, the Bell numbers count the possible partitions of a set.
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Carol number
A Carol number is an integer of the form 4^n - 2^ - 1.
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Catalan number
In combinatorial mathematics, the Catalan numbers form a sequence of natural numbers that occur in various counting problems, often involving recursively-defined objects.
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Chen prime
A prime number p is called a Chen prime if p + 2 is either a prime or a product of two primes (also called a semiprime).
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Colossally abundant number
In mathematics, a colossally abundant number (sometimes abbreviated as CA) is a natural number that, in a particular, rigorous sense, has many divisors.
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Cousin prime
In mathematics, cousin primes are prime numbers that differ by four.
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Factorial prime
A factorial prime is a prime number that is one less or one more than a factorial (all factorials > 1 are even).
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Fibonacci number
In mathematics, the Fibonacci numbers are the numbers in the following integer sequence, called the Fibonacci sequence, and characterized by the fact that every number after the first two is the sum of the two preceding ones: Often, especially in modern usage, the sequence is extended by one more initial term: By definition, the first two numbers in the Fibonacci sequence are either 1 and 1, or 0 and 1, depending on the chosen starting point of the sequence, and each subsequent number is the sum of the previous two.
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Fibonacci prime
A Fibonacci prime is a Fibonacci number that is prime, a type of integer sequence prime.
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Harmonic series (mathematics)
In mathematics, the harmonic series is the divergent infinite series: Its name derives from the concept of overtones, or harmonics in music: the wavelengths of the overtones of a vibrating string are,,, etc., of the string's fundamental wavelength.
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Kaprekar's routine
Kaprekar's routine is an algorithm in recreational mathematics devised by the Indian mathematician D. R. Kaprekar which produces a sequence of numbers which either converges to a constant value or results in a repeating cycle.
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Kynea number
A Kynea number is an integer of the form An equivalent formula is This indicates that a Kynea number is the nth power of 4 plus the (n + 1)th Mersenne number.
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Magic square
In recreational mathematics and combinatorial design, a magic square is a n\times n square grid (where is the number of cells on each side) filled with distinct positive integers in the range 1,2,...,n^2 such that each cell contains a different integer and the sum of the integers in each row, column and diagonal is equal.
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Motzkin number
In mathematics, a Motzkin number for a given number is the number of different ways of drawing non-intersecting chords between points on a circle (not necessarily touching every point by a chord).
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Myriad
A myriad (from Ancient Greek label) is technically the number ten thousand; in that sense, the term is used almost exclusively in translations from Greek, Latin, or Chinese, or when talking about ancient Greek numbers.
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Natural number
In mathematics, the natural numbers are those used for counting (as in "there are six coins on the table") and ordering (as in "this is the third largest city in the country").
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Pandigital number
In mathematics, a pandigital number is an integer that in a given base has among its significant digits each digit used in the base at least once.
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Pólya conjecture
In number theory, the Pólya conjecture stated that "most" (i.e., 50% or more) of the natural numbers less than any given number have an odd number of prime factors.
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Pell number
In mathematics, the Pell numbers are an infinite sequence of integers, known since ancient times, that comprise the denominators of the closest rational approximations to the square root of 2.
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Polydivisible number
In mathematics a polydivisible number (or magic number) is a number with digits abcde... that has the following properties.
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Prime number
A prime number (or a prime) is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers.
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Repdigit
In recreational mathematics, a repdigit or sometimes monodigit is a natural number composed of repeated instances of the same digit in a positional number system (often implicitly decimal).
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Repunit
In recreational mathematics, a repunit is a number like 11, 111, or 1111 that contains only the digit 1 — a more specific type of repdigit.
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Safe prime
A safe prime is a prime number of the form 2p + 1, where p is also a prime.
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Scientific notation
Scientific notation (also referred to as scientific form or standard index form, or standard form in the UK) is a way of expressing numbers that are too big or too small to be conveniently written in decimal form.
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Self-descriptive number
In mathematics, a self-descriptive number is an integer m that in a given base b is b digits long in which each digit d at position n (the most significant digit being at position 0 and the least significant at position b - 1) counts how many instances of digit n are in m.
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Smooth number
In number theory, a smooth (or friable) number is an integer which factors completely into small prime numbers.
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Social Security number
In the United States, a Social Security number (SSN) is a nine-digit number issued to U.S. citizens, permanent residents, and temporary (working) residents under section 205(c)(2) of the Social Security Act, codified as.
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Sophie Germain prime
In number theory, a prime number p is a Sophie Germain prime if 2p + 1 is also prime.
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Superior highly composite number
In mathematics, a superior highly composite number is a natural number which has more divisors than any other number scaled relative to some positive power of the number itself.
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Tetration
In mathematics, tetration (or hyper-4) is the next hyperoperation after exponentiation, and is defined as iterated exponentiation.
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Wagstaff prime
In number theory, a Wagstaff prime is a prime number p of the form where q is an odd prime.
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Wedderburn–Etherington number
The Wedderburn–Etherington numbers are an integer sequence named for Ivor Malcolm Haddon Etherington.
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10 crore, 100 million, 100,000,000 (number), 100000000, 100000000 (number), 10^8, 10⁸, 111,111,111, 111111111 (number), 1E8, 1e8, Hundred million, One hundred million.
References
[1] https://en.wikipedia.org/wiki/100,000,000
