Arithmetic progressions of primes and sums of squares

[Hugo Pfoertner]

Hugo Pfoertner schrieb:
> 
> > > Currently I'm searching for a(15)...
> >     If I may steal your thunder,
> >     a(15)=173471351, gap(15)=4144140
> 
> The thunder is still there! My program found a smaller a(15) this
> evening:
>  a(15)=136023703, gap(15)=6936930 (please check!)

Wrong!!!! Checked it myself and found 136023703-1*6936930= 129086773 =
8231 x 15683. Had forgotten to increase the sieve limit together with
the search dimension :-<<. Will restart search at 50*10^6. Sorry!

Hugo