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A115411 a(n) = least k such that semiprime(n) divides k-th triangular number. +0
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7, 3, 8, 4, 7, 5, 6, 11, 24, 12, 11, 16, 14, 19, 12, 23, 48, 17, 10, 18, 28, 31, 25, 23, 36, 21, 40, 34, 43, 29, 13, 30, 47, 19, 52, 36, 45, 59, 34, 120, 60, 41, 42, 56, 67, 47, 71, 65, 29, 72, 30, 79, 53, 69, 83, 168, 59, 88, 60, 74, 33, 96, 66, 100, 28, 40, 103, 76, 71, 107, 85 (list; graph; listen)
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Last modified December 3 22:15 EST 2009. Contains 170310 sequences.


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