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%I #13 Mar 01 2017 00:28:14
%S 5,5,5,5,2823521,151062433
%N Smallest odd prime of the form x^2 + y^2 such that x^(2^k) + y^(2^k) is prime for all k = 1 to n.
%e Prime 5 = 2^2 + 1 and 2^4 + 1, 2^8 + 1, 2^16 + 1 are Fermat primes.
%e Prime 2823521 = 464^2 + 1615^2 is a term.
%e a(n) x y
%e --------- ---- ----
%e 5 2 1
%e 5 2 1
%e 5 2 1
%e 5 2 1
%e 2823521 1615 464
%e 151062433 9777 7448
%Y Cf. A182199, A282352.
%K nonn,more
%O 1,1
%A _Thomas Ordowski_ and _Altug Alkan_, Feb 28 2017
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