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 A375459 #11 Sep 13 2024 07:34:04 %S A375459 21,18,15,51,195,435,76035 %N A375459 a(n) = smallest magic sum of any 3 X 3 magic square which contains exactly n squared primes, or 0 if no such magic square exists. %C A375459 a(9) = 0. %C A375459 a(n) = A268855(n+1) for n = 0, 1, 2, and 5. %C A375459 a(7) and a(8) - if nonzero, they are greater than 10^10. %H A375459 Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_079.htm">Puzzle 79. The Chebrakov's - by two months - challenge</a>, The Prime Puzzles and Problems Connection. %H A375459 Arkadiusz Wesolowski, <a href="/A375459/a375459.txt">Examples of these magic squares</a> %H A375459 <a href="/index/Mag#magic">Index entries for sequences related to magic squares</a> %Y A375459 Cf. A001248, A268855, A375361. %K A375459 nonn,fini,hard,more %O A375459 0,1 %A A375459 _Arkadiusz Wesolowski_, Aug 15 2024