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 A268856 #29 Jul 07 2022 02:27:00 %S A268856 39,36,30,21,21,15,27,675 %N A268856 a(n) = smallest magic sum of any 3 X 3 magic square which contains exactly n numbers that are triangular or square. %C A268856 a(8) and a(9) are greater than 10^10. - _Arkadiusz Wesolowski_, Oct 27 2018 %C A268856 a(8) <= 3*7215727335550^2 = (A221669(1) + A221669(2) + A221669(3))*16978181966^2. - _Arkadiusz Wesolowski_, May 21 2022 %H A268856 Andrew Bremner, <a href="http://www.multimagie.com/Bremner2.pdf">On squares of squares II</a>, Acta Arithmetica 99 (2001), pp. 289-308. %H A268856 Multimagic Squares, <a href="http://www.multimagie.com/">Home Page</a> %H A268856 The Prime Puzzles and Problems Connection, <a href="http://www.primepuzzles.net/problems/prob_063.htm">Problem 63</a> %H A268856 Arkadiusz Wesolowski, <a href="/A268856/a268856.txt">Examples of these magic squares</a> %H A268856 Wikipedia, <a href="https://en.wikipedia.org/wiki/Magic_square">Magic square</a> %H A268856 <a href="/index/Mag#magic">Index entries for sequences related to magic squares</a> %Y A268856 Cf. A268854, A268855, A269231. %K A268856 nonn,fini,hard,more %O A268856 0,1 %A A268856 _Arkadiusz Wesolowski_, Feb 14 2016