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 A235718 #20 Feb 22 2025 18:54:19 %S A235718 169,196,256,289,324,361,529,576,625,729,784,841,961,1156,1225,1521, %T A235718 1600,1681,2025,2116,2209,2500,3136,3364,3600,3844,3969,4225,4489, %U A235718 4624,4900,5625,5776,5929,6400,6561,6889,7225,8100,8281,8464,8836,9409,10201,10404 %N A235718 Squares which have one or more occurrences of exactly three different digits. %C A235718 The first term having a repeated digit is 1156. %H A235718 Giovanni Resta, <a href="/A235718/b235718.txt">Table of n, a(n) for n = 1..12299</a> (terms < 10^36, first 600 terms from Colin Barker) %F A235718 a(n) = A054031(n)^2. %e A235718 5929 is in the sequence because 5929 = 77^2 and 5929 contains exactly three different digits: 2, 5 and 9. %o A235718 (PARI) s=[]; for(n=1, 200, if(#vecsort(eval(Vec(Str(n^2))),,8)==3, s=concat(s, n^2))); s %Y A235718 Cf. A054031, A225218, A235717, A235719-A235724. %K A235718 nonn,base %O A235718 1,1 %A A235718 _Colin Barker_, Jan 15 2014