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en.wikipedia.org
15 is: The eighth composite number and the sixth semiprime and the first odd and fourth discrete semiprime; [1] its proper divisors are 1, 3, and 5, so the first of the form (3.q), [2] where q is a higher prime. a deficient number, a lucky number, a bell number (i.e., the number of partitions for a set of size 4), [3] a pentatope number, [4 ...
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