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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). 21 is the first member of the second cluster of consecutive discrete semiprimes (21, 22), where the next such cluster is (33, 34, 35). There are 21 prime numbers with 2 digits.
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A tiling with squares whose side lengths are successive Fibonacci numbers: 1, 1, 2, 3, 5, 8, 13 and 21. The Fibonacci numbers were first described in Indian mathematics as early as 200 BC in work by Pingala on enumerating possible patterns of Sanskrit poetry formed from syllables of two lengths.
Ordinal numbers characterize well-ordered sets, or counting carried on to any stopping point, including points after an infinite number have already been counted. Generalizing finite and (ordinary) infinite sequences which are maps from the positive integers leads to mappings from ordinal numbers to transfinite sequences. Cardinal numbers ...
1619 [21] & 1668 [22] Lemniscate constant [23] ... Rational numbers have two continued fractions; the version in this list is the shorter one.
Schieffelin scores 21, No. 13 Clemson comes from behind to beat Virginia 71-58. Sports. USA TODAY Sports. 2025 NHL trade deadline tracker: Analyzing all of hockey's biggest moves. Weather.
Euclid's theorem is a fundamental statement in number theory that asserts that there are infinitely many prime numbers. ... For example, 75,600 = 2 4 3 3 5 2 7 1 = 21 ...
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