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 A358702 #5 Dec 04 2022 08:34:12 %S A358702 1,0,0,2,0,0,4,0,3,8,0,0,7,0,0,13,0,24,17,0,0,43,0,0,67,0,63,134,0,0, %T A358702 83,0,0,167,0,264,314,0,0,313,0,0,707,0,1374,836,0,0,1667,0,0,2236,0, %U A358702 3114,4472,0,0,6833,0,0,8167,0,8937,16667,0,0,21886,0,0,29614 %N A358702 a(n) is the least k > 0 such that the sum of the decimal digits of k^2 is n, or 0 if no such k exists. %Y A358702 The nonzero terms are A067179. %Y A358702 Cf. A056991, A231897 (similar for binary weight). %K A358702 nonn,base %O A358702 1,4 %A A358702 _Hugo Pfoertner_, Dec 04 2022