Class number of real quadratic field Q(sqrt f), where f is the n-th squarefree number A005117(n).
1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 2, 2, 1, 1, 2, 1, 2, 1, 1, 1, 2, 1, 2, 1
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Tue Mar 20 19:57:41 CET 2012 [seqfan] Re: SeqFan Digest, Vol 42, Issue 7