[seqfan] Re: Terms in A112801 (n=sum of three semiprimes)
Don Reble
djr at nk.ca
Mon Jun 9 19:28:14 CEST 2014
> I face problems reproducing the terms in A112801. ...
> 2*9-1 = 17 = 4+4+9
> ...
> The sequence would not continue
> 1, 0, 1, 2, 2, 2, 4, 4, 4... but
> 1, 1, 1, 2, 2, 3, 4, 2, 5, 5, 4, 6, 7, 6 (?!)
> Perhaps it is only odd semiprimes?
I get the same terms as the authors. It has nothing to do with
semiprimes, but "integers with 2 distinct prime factors".
(A007774: 6, 10, 12, 14, 15, 18, 20, 21, ...)
--
Don Reble djr at nk.ca
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