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  2. Factorial - Wikipedia

    en.wikipedia.org/wiki/Factorial

    11: 39 916 800: 12: 479 001 600: 13: 6 227 020 800: 14: 87 178 291 200: 15: 1 307 674 ... The factorial number system is a mixed radix notation for numbers in which ...

  3. Factorial number system - Wikipedia

    en.wikipedia.org/wiki/Factorial_number_system

    The factorial number system is sometimes defined with the 0! place omitted because it is always zero (sequence A007623 in the OEIS). In this article, a factorial number representation will be flagged by a subscript "!". In addition, some examples will have digits delimited by a colon. For example, 3:4:1:0:1:0! stands for

  4. Stirling's approximation - Wikipedia

    en.wikipedia.org/wiki/Stirling's_approximation

    De Moivre gave an approximate rational-number expression for the natural logarithm of the constant. Stirling's contribution consisted of showing that the constant is precisely 2 π {\displaystyle {\sqrt {2\pi }}} .

  5. Factorion - Wikipedia

    en.wikipedia.org/wiki/Factorion

    A natural number is a sociable factorion if it is a periodic point for , where ⁡ = for a positive integer, and forms a cycle of period . A factorion is a sociable factorion with k = 1 {\displaystyle k=1} , and a amicable factorion is a sociable factorion with k = 2 {\displaystyle k=2} .

  6. Double factorial - Wikipedia

    en.wikipedia.org/wiki/Double_factorial

    In mathematics, the double factorial of a number n, ... the double factorial may be expressed in terms of k-permutations of 2k [1] [11] or a falling factorial as ...

  7. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    This is the minimum number of characters needed to encode a 32 bit number into 5 printable characters in a process similar to MIME-64 encoding, since 85 5 is only slightly bigger than 2 32. Such method is 6.7% more efficient than MIME-64 which encodes a 24 bit number into 4 printable characters. 89

  8. Table of Gaussian integer factorizations - Wikipedia

    en.wikipedia.org/wiki/Table_of_Gaussian_Integer...

    A Gaussian integer is either the zero, one of the four units (±1, ±i), a Gaussian prime or composite.The article is a table of Gaussian Integers x + iy followed either by an explicit factorization or followed by the label (p) if the integer is a Gaussian prime.

  9. Factorial prime - Wikipedia

    en.wikipedia.org/wiki/Factorial_prime

    A factorial prime is a prime number that is one less or one more than a factorial (all factorials greater than 1 are even). [1] ... 11, 12, 14) are ...