a(1)=1, a(2)=2. For n >=3, a(n) = the smallest positive integer not occurring earlier in the sequence such that a(n)*a(n-1)/a(n-2) is an integer.
1, 2, 3, 4, 6, 8, 9, 16, 18, 24, 12, 10, 30, 5, 36, 15, 48, 20, 60, 7, 120, 14, 180, 21, 240
3 seqfan posts
Sat May 16 19:03:33 CEST 2009 [seqfan] Re: Ratio-Related Sequence A160256
Thu May 7 02:41:31 CEST 2009 [seqfan] Re: Ratio-Related Sequence: Permutation Of +Integers?
Wed May 6 23:48:13 CEST 2009 [seqfan] Ratio-Related Sequence: Permutation Of +Integers?
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
Links to OEIS content are included according to
The OEIS End-User License Agreement
.