[seqfan] Re: A169580 and Catalan's empirical claim that the triple of any odd square not divisible by 5 is a sum of squares of three primes other than 2 and 3.
Charles Greathouse
charles.greathouse at case.edu
Wed Mar 3 19:14:04 CET 2010
I think A028375 would be a better place:
Squares of (odd numbers not divisible by 5).
A169580 allows nonprimes, 2, and 3 so it doesn't seem to have much of
a connection.
Charles Greathouse
Analyst/Programmer
Case Western Reserve University
On Wed, Mar 3, 2010 at 12:58 PM, Jonathan Post <jvospost3 at gmail.com> wrote:
> Catalan stated empirically that the triple of any odd square not
> divisible by 5 is a sum of squares of three primes other than 2 and 3.
>
> Is this worth adding as a comment about a subsequence of to njas's new seq
> A169580 Squares of the form x^2+y^2+z^2 with x,y,z positive integers.
>
>
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