[seqfan] Re: nonpowers in A001481

[Joerg Arndt]

* N. J. A. Sloane <njas at research.att.com> [Jan 15. 2011 19:41]:
> [...]

> Me: Yes! You might mention that these are the set-difference Athis \ Athat.
> 
  http://oeis.org/draft/A180161

> Also that these are the numbers n = 2^i Product_{p == 3 mod 4} p^2j
> Product_{p == 1 mod 4 } p^k where gcd{i, 2j's, k's} = 1

Not so sure about this one: 9 is not a term, 18 is a term.

> 
> Neil
> 

Ready for merciless editing.