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  2. Double factorial - Wikipedia

    en.wikipedia.org/wiki/Double_factorial

    These are counted by the double factorial 15 = (6 − 1)‼. In mathematics, the double factorial of a number n, denoted by n‼, is the product of all the positive integers up to n that have the same parity (odd or even) as n. [1] That is,

  3. 1,000,000,000 - Wikipedia

    en.wikipedia.org/wiki/1,000,000,000

    This is an accepted version of this page This is the latest accepted revision, reviewed on 24 December 2024. See also: Orders of magnitude (numbers) and Long and short scales Natural number 1000000000 List of numbers Integers ← 10 0 10 1 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 Cardinal One billion (short scale) One thousand million, or one milliard (long scale) Ordinal One billionth (short ...

  4. Factorial - Wikipedia

    en.wikipedia.org/wiki/Factorial

    For example, 9!! = 1 × 3 × 5 × 7 × 9 = 945. Double factorials are used in trigonometric integrals, [92] in expressions for the gamma function at half-integers and the volumes of hyperspheres, [93] and in counting binary trees and perfect matchings. [91] [94] Exponential factorial

  5. Wheat and chessboard problem - Wikipedia

    en.wikipedia.org/wiki/Wheat_and_chessboard_problem

    The total number of grains can be shown to be 2 64 −1 or 18,446,744,073,709,551,615 (eighteen quintillion, four hundred forty-six quadrillion, seven hundred forty-four trillion, seventy-three billion, seven hundred nine million, five hundred fifty-one thousand, six hundred and fifteen, over 1.4 trillion metric tons), which is over 2,000 times ...

  6. Orders of magnitude (numbers) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(numbers)

    1 × 10 −398 is equal to the smallest non-zero value that can be represented by a double ... 1.4 billion cars in the world ... 1 is a 2,193,027-digit factorial ...

  7. 10,000,000 - Wikipedia

    en.wikipedia.org/wiki/10,000,000

    34,459,425 = double factorial of 17 34,012,224 = 5832 2 = 324 3 = 18 6 34,636,834 = number of 31-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed [ 15 ]

  8. Large numbers - Wikipedia

    en.wikipedia.org/wiki/Large_numbers

    A natural language numbering system allows for representing large numbers using names that more clearly distinguish numeric scale than a series of digits. For example "billion" may be easier to comprehend for some readers than "1,000,000,000".

  9. 100,000,000 - Wikipedia

    en.wikipedia.org/wiki/100,000,000

    This is an accepted version of this page This is the latest accepted revision, reviewed on 31 December 2024. "Hundred million" redirects here. For the song by Treble Charger, see Hundred Million. Natural number 100000000 List of numbers Integers ← 10 0 10 1 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 Cardinal One hundred million Ordinal 100000000th (one hundred millionth) Factorization 2 8 × 5 ...