[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.

[Jonathan Post]

Apologies; I hit "send" before adding:

Catalan stated and Realis proved that every power of 3 is a sum of
three squares relatively prime to 3.

On Wed, Mar 3, 2010 at 9:58 AM, 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.
>