This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A283076 #13 Mar 01 2017 00:28:14 %S A283076 5,5,5,5,2823521,151062433 %N A283076 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 A283076 Prime 5 = 2^2 + 1 and 2^4 + 1, 2^8 + 1, 2^16 + 1 are Fermat primes. %e A283076 Prime 2823521 = 464^2 + 1615^2 is a term. %e A283076 a(n) x y %e A283076 --------- ---- ---- %e A283076 5 2 1 %e A283076 5 2 1 %e A283076 5 2 1 %e A283076 5 2 1 %e A283076 2823521 1615 464 %e A283076 151062433 9777 7448 %Y A283076 Cf. A182199, A282352. %K A283076 nonn,more %O A283076 1,1 %A A283076 _Thomas Ordowski_ and _Altug Alkan_, Feb 28 2017