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 A235721 #15 Apr 18 2017 16:17:54 %S A235721 103684,104329,104976,107584,123904,124609,132496,134689,139876, %T A235721 140625,157609,162409,164025,170569,173056,180625,195364,198025, %U A235721 207936,209764,214369,237169,254016,257049,258064,259081,279841,293764,310249,318096,321489,326041 %N A235721 Squares which have one or more occurrences of exactly six different digits. %C A235721 The first term having a repeated digit is 1028196. %H A235721 Colin Barker, <a href="/A235721/b235721.txt">Table of n, a(n) for n = 1..1000</a> %F A235721 a(n) = A054034(n)^2. %e A235721 124609 is in the sequence because 124609 = 353^2 and 124609 contains exactly six different digits: 0, 1, 2, 4, 6 and 9. %o A235721 (PARI) s=[]; for(n=1, 1200, if(#vecsort(eval(Vec(Str(n^2))),,8)==6, s=concat(s, n^2))); s %Y A235721 Cf. A235717-A235720, A235722-A235724, A225218. %K A235721 nonn,base %O A235721 1,1 %A A235721 _Colin Barker_, Jan 15 2014