17p+625 = k^2
17p = (k+25)(k25) and 17 factors at least one of the factors.
If (k+25) = 17a, p=a(17a50). a=1 makes (17a50) negative so (17a50)=1 and a=p=3.
If (k25) = 17a, p=a(17a+50). Here, (17a+50)=1 isn't possible so a=1, 17a+50=p=67.

Posted by xdog
on 20130215 20:12:31 