a(n) is smallest number which avoids any 3-term geometric progression.
1, 2, 3, 5, 6, 7, 8, 10, 11, 13, 14, 15, 16, 17, 19, 21, 22, 23, 24, 26, 27, 29, 30, 31, 33
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Fri Oct 29 05:35:16 CEST 2010 [seqfan] Implementing first 500 sequences in Java