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A140661 Number of pairs (b,c) with the same prime factors, 1<=b<=c<=n. +0
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2, 3, 5, 6, 7, 8, 11, 13, 14, 15, 17, 18, 19, 20, 24, 25, 28, 29, 31, 32, 33, 34, 38, 40, 41, 44, 46, 47, 48, 49, 54, 55, 56, 57, 62, 63, 64, 65, 68, 69, 70, 71, 73, 75, 76, 77, 83, 85, 89, 90, 92, 93, 100, 101, 104, 105, 106, 107, 109, 110, 111, 113, 119, 120, 121, 122 (list; graph; listen)
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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