[seqfan] Numbers with squarefree exponents in their prime factorizations

Charles Greathouse charles.greathouse at case.edu
Wed Sep 2 21:19:07 CEST 2015

I was looking at sequence A209061 today and wondered what its density was.
With A046100 as a subsequence it's at least 1/zeta(4) = 0.92..., of course.
But I can't quite figure out what Euler product to use here -- can anyone
help out to improve the sequence?

Charles Greathouse
Case Western Reserve University

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