> --- In primenumbers@yahoogroups.com, "Werner D. Sand" wrote:

> >

> > In words: If N is a square (N=m²) and N+1 and N-7 are primes,

> > then N-5 is a prime, too.

>

> Stated like this, it is indeed more or less trivial.

er... I read but you didn't write:

"...and there is a prime between N-7 and N+1, ..."

else we have counter-examples for m =

54,66,90,156,240,270,306,474,570,576,636,750,780,1080,1320,1350,2034,

2154,2406,2700,2760,3204,3240,3306,3480,3516,3756,3774,3984,4056,4086,

4140,4146,4176,4716,4734,4794,5154,5370,5424,5550,5664,5700,5850,5856,

5970,6030,6060,6120,6366,6576,6714,6786,7050,7164,8196,8424,8454,8940,

9180,9246,9486,9696,9804...