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 A268913 #8 Feb 20 2016 21:10:27 %S A268913 53,59,61,65,67,71,73,77,79,83,85,89,91,95,97,99,101,103,107,109,113, %T A268913 115,117,119,121,123,125,127,129,131,133,135,137,139,141,143,145,147, %U A268913 149,151,153,155,157,159,161,163,165,167,169,171 %N A268913 Magic sums of 3 X 3 semimagic squares composed of primes. %C A268913 This sequence is infinite because the Green-Tao theorem implies that sequence A268790 is infinite. %C A268913 I conjecture that every odd number greater than 111 belongs to this sequence. %H A268913 <a href="/index/Mag#magic">Index entries for sequences related to magic squares</a> %e A268913 Examples of 3 X 3 semimagic squares composed of primes. %e A268913 . %e A268913 |---|---|---| %e A268913 | 3 | 13| 37| %e A268913 |---|---|---| %e A268913 | 31| 17| 5 | %e A268913 |---|---|---| %e A268913 | 19| 23| 11| %e A268913 |---|---|---| %e A268913 The magic constant is 53 = a(1). %e A268913 . %e A268913 |---|---|---| %e A268913 | 3 | 13| 43| %e A268913 |---|---|---| %e A268913 | 37| 17| 5 | %e A268913 |---|---|---| %e A268913 | 19| 29| 11| %e A268913 |---|---|---| %e A268913 The magic constant is 59 = a(2). %Y A268913 Cf. A268912. Supersequence of A268790. %K A268913 nonn %O A268913 1,1 %A A268913 _Arkadiusz Wesolowski_, Feb 15 2016