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A117386 Positive integers, each occurring twice in the sequence, such that a(n) = a(k) when n+k = 6*a(n), starting with a(1)=1 and filling the next vacant position with the smallest unused number. +0
3
1, 2, 3, 4, 1, 5, 6, 7, 8, 2, 9, 10, 11, 12, 3, 13, 14, 15, 16, 4, 17, 18, 19, 5, 20, 21, 22, 23, 6, 24, 25, 26, 27, 7, 28, 29, 30, 31, 8, 32, 33, 34, 9, 35, 36, 37, 38, 10, 39, 40, 41, 42, 11, 43, 44, 45, 46, 12, 47, 48, 49, 13, 50, 51, 52, 53, 14, 54, 55, 56, 57, 15, 58, 59, 60, 61 (list; graph; listen)
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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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