a(1) = 1, a(2) = 2 and then the smallest number not occurring earlier such that every term divides the product of its neighbors: a(n-1)*a(n+1)/a(n) is an integer.
1, 2, 4, 6, 3, 5, 10, 8, 12, 9, 15, 20, 16, 24, 18, 21, 7, 11, 22, 14, 28, 26, 13, 17, 34, 30
3 seqfan posts
Sat May 16 19:03:33 CEST 2009 [seqfan] Re: Ratio-Related Sequence A160256