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 A269905 #11 Mar 12 2016 22:23:27 %S A269905 2,0,199,53297929 %N A269905 Smallest of n^2 primes in an arithmetic progression that form an n X n magic square with the least magic sum, or 0 if no such magic square exists. %C A269905 a(n) > 0 for every n >= 3 under Dickson's conjecture. %H A269905 Wikipedia, <a href="http://en.wikipedia.org/wiki/Magic_square">Magic square</a> %H A269905 Wikipedia, <a href="https://en.wikipedia.org/wiki/Primes_in_arithmetic_progression">Primes in arithmetic progression</a> %H A269905 <a href="/index/Mag#magic">Index entries for sequences related to magic squares</a> %H A269905 <a href="/index/Pri#primes_AP">Index entries for sequences related to primes in arithmetic progressions</a> %Y A269905 Cf. A113827, A269325, A269904. %K A269905 nonn,hard,more %O A269905 1,1 %A A269905 _Arkadiusz Wesolowski_, Mar 07 2016