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 A121996 #9 Jan 26 2014 21:40:16 %S A121996 0,1,2,4,5,8,9,10,13,16,17,18,20,21,22,24,25,26,28,29,30,32,33,34,36, %T A121996 37,38,40,41,42,44,45,46,48,49,50,52,53,54,56,57,58,60,61,62,64,65,66, %U A121996 68,69,70,72,73,74,76,77,78,80,81,82,84,85,86,88,89,90,92,93,94,96,97,98 %N A121996 Sums of two squares mod 100. %C A121996 All 72 possible values of ((m^2+n^2) mod 100) for all m's and n's. Not-sums of two squares mod 100 are: 3, 6, 7, 11, 12, 14, 15, 19, 23, 27, 31, 35, 39, 43, 47, 51, 55, 59, 63, 67, 71, 75, 79, 83, 87, 91, 95, 99 (28 terms). %C A121996 Cf. A010461 Squares mod 100, A001481 Sums of 2 squares. %Y A121996 Cf. A010461, A001481. %K A121996 fini,full,nonn %O A121996 1,3 %A A121996 _Zak Seidov_, Sep 11 2006