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 A087738 #14 Nov 11 2019 03:52:07
%S A087738 1,2,1,4,2,1,6,4,2,1,10,6,4,2,1,12,10,6,4,2,1,16,14,16,118,44,30,1,18,
%T A087738 16,20,132,74,54,102,1,22,20,24,140,76,96,162,120,1,28,24,28,152,94,
%U A087738 112,274,190,278,1,30,26,34,208,156,114,300,234,614,46,1,36,36,46,240,158
%N A087738 Square array: T(n,k) gives n-th number a such that a^(2^k)+1 is prime (a generalized Fermat).
%D A087738 Harvey Dubner, J. Recr. Math., 18, 1986.
%H A087738 Yves Gallot, <a href="http://yves.gallot.pagesperso-orange.fr/primes/">Generalized Fermat Prime Search</a>.
%e A087738 {1}; {2,1}; {4,2,1}; ...
%e A087738 See the well-formed array on Gallot's page.
%Y A087738 Cf. A056993, A006093, A005574, A000068, A006314, A006313, A006315, A006316, A056994, A056995, A057465, A057002, A088361, A088362.
%K A087738 nonn,tabl
%O A087738 0,2
%A A087738 _Jeppe Stig Nielsen_, Oct 01 2003