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 A235717 #12 Apr 18 2017 16:15:15 %S A235717 16,25,36,49,64,81,100,121,144,225,400,441,484,676,900,1444,7744, %T A235717 10000,11881,29929,40000,44944,55225,69696,90000,1000000,4000000, %U A235717 9000000,9696996,100000000,400000000,900000000,6661661161,10000000000,40000000000,90000000000 %N A235717 Squares which have one or more occurrences of exactly two different digits. %C A235717 The first term having a repeated digit is 100. %C A235717 This sequence is the same as A018885, except that A018885 has four additional leading terms. %F A235717 a(n) = A016069(n)^2. %e A235717 69696 is in the sequence because 69696 = 264^2 and 69696 contains exactly two different digits: 6 and 9. %o A235717 (PARI) s=[]; for(n=1,10000, if(#vecsort(eval(Vec(Str(n^2))),,8)==2, s=concat(s, n^2))); s %Y A235717 Cf. A235718-A235724, A225218. %K A235717 nonn,base %O A235717 1,1 %A A235717 _Colin Barker_, Jan 15 2014