> is A004612 the complement of A135412 ?
A135412 has multiples of non-square values of A034017,
so if that comment is right...
> %N A034017 Numbers that are primitively represented by x^2+xy+y^2.
> %F A034017 3^{0 or 1} X product of primes of form 3a+1 to any power.
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Don Reble djr at nk.ca