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 A059931 #7 Oct 26 2019 17:53:06 %S A059931 4,9,16,49,64,81,289,324,576,841,2809,2916,3249,3481,5184,6241,7056, %T A059931 43681,67081,321489,651249,729316 %N A059931 Numbers n such that n and n^(1/2) combined use different digits. %C A059931 There are exactly 22 solutions in base 10. %Y A059931 Cf. A059930, A029783. %K A059931 nonn,base,fini,full %O A059931 1,1 %A A059931 _Patrick De Geest_, Feb 15 2001