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  2. 21 (drinking game) - Wikipedia

    en.wikipedia.org/wiki/21_(drinking_game)

    Prohibiting calling out a series of numbers that sum to 21 (e.g. "6, 7, 8" or "10, 11") Examples of new rules that could be instated by a player forced to call 21: Swapping two numbers around (e.g. 3 and 13 are switched) Replacing a number with a humorous phrase (e.g. replacing 5 with "skin" - causing the sequence 1, 2, 3, "foreskin")

  3. Look-and-say sequence - Wikipedia

    en.wikipedia.org/wiki/Look-and-say_sequence

    1 is read off as "one 1" or 11. 11 is read off as "two 1s" or 21. 21 is read off as "one 2, one 1" or 1211. 1211 is read off as "one 1, one 2, two 1s" or 111221. 111221 is read off as "three 1s, two 2s, one 1" or 312211. The look-and-say sequence was analyzed by John Conway [1] after he was introduced to it by one of his students at a party. [2 ...

  4. 21 (number) - Wikipedia

    en.wikipedia.org/wiki/21_(number)

    As a biprime with proper divisors 1, 3 and 7, twenty-one has a prime aliquot sum of 11 within an aliquot sequence containing only one composite number (21, 11, 1, 0); it is the second composite number with an aliquot sum of 11, following 18. 21 is the first member of the second cluster of consecutive discrete semiprimes (21, 22), where the next such cluster is (33, 34, 35).

  5. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    Such method is 6.7% more efficient than MIME-64 which encodes a 24 bit number into 4 printable characters. 89: Largest base for which all left-truncatable primes are known. 90: Nonagesimal: Related to Goormaghtigh conjecture for the generalized repunit numbers (111 in base 90 = 1111111111111 in base 2). 95: Number of printable ASCII characters ...

  6. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    Download as PDF; Printable version ... A tiling with squares whose side lengths are successive Fibonacci numbers: 1, 1, 2, 3, 5, 8, 13 and 21. ... The first 20 ...

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  9. Table of divisors - Wikipedia

    en.wikipedia.org/wiki/Table_of_divisors

    Download as PDF; Printable version ... Plot of the number of divisors of integers from 1 to 1000. Highly composite numbers are in bold and superior highly composite ...

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