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 A368676 #20 Feb 04 2024 21:26:48 %S A368676 128,0,0,160,0,0,224,0,64,384,64,192,2112,96,224,4768,0,480,5472,160, %T A368676 1088,6688,160,1632,13600,416,1728,24640,544,3008,40736,512,6720, %U A368676 45504,672,11776,41984,2752,17888,65760,4416,18688,128544,4544,21888,162240,3712 %N A368676 Number of 4 X 4 prime magic squares with magic sum 2n. %H A368676 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PrimeMagicSquare.html">Prime Magic Square</a>. %e A368676 [17, 11, 31, 61] %e A368676 [43, 67, 3, 7] %e A368676 [41, 37, 13, 29] %e A368676 [19, 5, 73, 23] %e A368676 is a 4 X 4 prime magic square in which the elements in each row and column and both diagonals sum to 120 and all elements are prime numbers. There are a total of 128 such prime magic squares so a(60)=128. %Y A368676 Cf. A006052, A073520, A073521, A271578. %K A368676 nonn %O A368676 60,1 %A A368676 _Zhao Hui Du_, Jan 02 2024