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 A270830 #7 Mar 29 2016 22:38:31 %S A270830 2,0,21821,5,13,7,7,79,37,23,67,89,13,89,131,31,71,47,43,73,277,353, %T A270830 41,67,127,223,79,13,193,5,23,43,5,67,3,19,5,59,59,653,19,19,97,409,5, %U A270830 383,29,137,379,349,653,1187,47,41,37,17,619,89,283,283,43,479,191 %N A270830 Smallest of n^2 consecutive primes that form an n X n semimagic square with the least magic sum, or 0 if no such magic square exists. %C A270830 a(n) <= A104157. For n = 3 and 4, a(n) is different from A104157(n). %H A270830 <a href="/index/Mag#magic">Index entries for sequences related to magic squares</a> %Y A270830 Cf. A104157, A265139, A265614, A270829. %K A270830 nonn %O A270830 1,1 %A A270830 _Arkadiusz Wesolowski_, Mar 23 2016