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%I #3 Mar 30 2012 18:40:00
%S 17,97,257,641,1297,881,2417
%N Primes equal to the sum of two integers squares, integers whose sum form prime(n) congruent to 1 (mod 4).
%e a(1)=17 because 4^2+1^2=17 and 4+1=prime(3)=5;
%e a(2)=97 because 9^2+4^2=97 and 9+4=prime(6)=13;
%e a(3)=257 because 16^2+1^2=257 and 16+1=prime(7)=17.
%K easy,nonn
%O 1,1
%A _Giovanni Teofilatto_, Mar 29 2005
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