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A111453 a(1)=1; for n>1, a(n) is smallest positive integer not occurring earlier in the sequence such that |a(n)-a(n-1)| is composite. +0
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1, 5, 9, 3, 7, 11, 2, 6, 10, 4, 8, 12, 16, 20, 14, 18, 22, 13, 17, 21, 15, 19, 23, 27, 31, 25, 29, 33, 24, 28, 32, 26, 30, 34, 38, 42, 36, 40, 44, 35, 39, 43, 37, 41, 45, 49, 53, 47, 51, 55, 46, 50, 54, 48, 52, 56, 60, 64, 58, 62, 66, 57, 61, 65, 59, 63, 67, 71, 75, 69, 73, 77 (list; graph; listen)
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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.


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