[seqfan] Re: Sequences counting distinct factorizations in a non-UFD
Alonso Del Arte
alonso.delarte at gmail.com
Wed Oct 29 02:46:27 CET 2014
Should've written "2 * 3 * (4 - sqrt(10))(4 + sqrt(10)) count as a distinct
factorization apart from 2^2 * 3^2 and (4 - sqrt(10))^2 (4 + sqrt(10))^2"
in that previous message. Sorry.
On Tue, Oct 28, 2014 at 9:44 PM, Alonso Del Arte <alonso.delarte at gmail.com>
> I suspect some sequences like this one, if not exactly this one, are
> already in the OEIS, but I haven't had the time to sit down to work out the
> theory and verify the identifications:
> a(n) counts how many distinct factorizations n has in Z[sqrt(10)].
> It is a very well-known fact that a(6) = 2.
> But I haven't seen discussion anywhere of what a(36) is. Does 6 * (4 -
> sqrt(10))(4 + sqrt(10)) count as a distinct factorization apart from 6^2
> and (4 - sqrt(10))^2 (4 + sqrt(10))^2? Should it count?
> P.S. I am aware of the all 1's sequence being the equivalent for UFDs.
> Alonso del Arte
> Author at SmashWords.com
> Musician at ReverbNation.com <http://www.reverbnation.com/alonsodelarte>
Alonso del Arte
Author at SmashWords.com
Musician at ReverbNation.com <http://www.reverbnation.com/alonsodelarte>
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