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21, Bagram, or Twenty Plus One is a drinking game. The game progresses by counting up from 1 to 21, with the player who calls "21" suffering a drinking penalty before the next round starts. The loser may add 1 new rule to the game, and starts the new round.
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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).
Download as PDF; Printable version; ... 20: a score (first power of the ... 9 + 1 / 2 Numbers with a decimal point may be read as a cardinal number, then "and ...
Mersenne primes, named after the friar Marin Mersenne, are prime numbers that can be expressed as 2 p − 1 for some positive integer p. For example, 3 is a Mersenne prime as it is a prime number and is expressible as 2 2 − 1 .
Download as PDF; Printable version; ... The notation is similar to the older Roman numerals for numbers 1 to 9 (I, II, III, IV, V, ... More numbers up to 19 or 20 ...
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