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 A235722 #15 Apr 18 2017 16:18:19 %S A235722 1034289,1046529,1048576,1054729,1056784,1073296,1075369,1085764, %T A235722 1238769,1247689,1354896,1380625,1382976,1432809,1507984,1605289, %U A235722 1607824,1630729,1695204,1708249,1750329,1763584,1803649,1827904,1836025,1890625,1946025,1974025 %N A235722 Squares which have one or more occurrences of exactly seven different digits. %C A235722 The first term having a repeated digit is 10137856. %H A235722 Colin Barker, <a href="/A235722/b235722.txt">Table of n, a(n) for n = 1..1000</a> %F A235722 a(n) = A054035(n)^2. %e A235722 1247689 is in the sequence because 1247689 = 1117^2 and 1247689 contains exactly seven different digits: 1, 2, 4, 6, 7, 8 and 9. %t A235722 sddQ[n_]:=Count[DigitCount[n],_?(#>0&)]==7; Select[Range[1001,1450]^2, sddQ] (* _Harvey P. Dale_, Mar 12 2015 *) %o A235722 (PARI) s=[]; for(n=1, 10000, if(#vecsort(eval(Vec(Str(n^2))),,8)==7, s=concat(s, n^2))); s %Y A235722 Cf. A235717-A235721, A235723, A235724, A225218. %K A235722 nonn,base %O A235722 1,1 %A A235722 _Colin Barker_, Jan 15 2014