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A109465 a(1)=1; for n>1, a(n) = smallest positive integer not among the earlier terms of the sequence that is divisible by a different number of distinct primes than a(n-1). +0
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1, 2, 6, 3, 10, 4, 12, 5, 14, 7, 15, 8, 18, 9, 20, 11, 21, 13, 22, 16, 24, 17, 26, 19, 28, 23, 30, 25, 33, 27, 34, 29, 35, 31, 36, 32, 38, 37, 39, 41, 40, 42, 43, 44, 47, 45, 49, 46, 53, 48, 59, 50, 60, 51, 61, 52, 64, 54, 66, 55, 67, 56, 70, 57, 71, 58, 73, 62, 78, 63, 79, 65 (list; graph; listen)
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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.


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