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 A271583 #7 Apr 14 2016 10:05:49 %S A271583 509020,736300,860932,1368340,2431780 %N A271583 Magic sums of 4 X 4 magic squares composed of squares of primes. %H A271583 The Prime Puzzles and Problems Connection, <a href="http://www.primepuzzles.net/puzzles/puzz_288.htm">Puzzle 288</a> %H A271583 <a href="/index/Mag#magic">Index entries for sequences related to magic squares</a> %e A271583 Examples of 4 X 4 magic squares composed of squares of primes. %e A271583 . %e A271583 |-----|-----|-----|-----| %e A271583 | 29^2| 71^2|277^2|653^2| %e A271583 |-----|-----|-----|-----| %e A271583 |191^2|647^2|211^2| 97^2| %e A271583 |-----|-----|-----|-----| %e A271583 |673^2|139^2|163^2|101^2| %e A271583 |-----|-----|-----|-----| %e A271583 |137^2|257^2|601^2|251^2| %e A271583 |-----|-----|-----|-----| %e A271583 The magic constant is 509020 = a(1). %e A271583 . %e A271583 |-----|-----|-----|-----| %e A271583 |179^2|107^2|383^2|739^2| %e A271583 |-----|-----|-----|-----| %e A271583 |353^2|691^2|331^2|157^2| %e A271583 |-----|-----|-----|-----| %e A271583 |761^2|283^2|263^2| 89^2| %e A271583 |-----|-----|-----|-----| %e A271583 | 23^2|409^2|641^2|397^2| %e A271583 |-----|-----|-----|-----| %e A271583 The magic constant is 736300 = a(2). %Y A271583 Cf. A271580. Subsequence of A271582. %K A271583 nonn,more %O A271583 1,1 %A A271583 _Arkadiusz Wesolowski_, Apr 10 2016