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 A054034 #14 Oct 27 2023 22:00:46
%S A054034 322,323,324,328,352,353,364,367,374,375,397,403,405,413,416,425,442,
%T A054034 445,456,458,463,487,504,507,508,509,529,542,557,564,567,571,572,574,
%U A054034 584,589,591,593,597,598,616,618,621,625,626,629,634,637,639,645,647
%N A054034 Numbers n such that n^2 contains exactly 6 different digits.
%H A054034 John Cerkan, <a href="/A054034/b054034.txt">Table of n, a(n) for n = 1..10000</a>
%p A054034 f := []; for i from 0 to 200 do if nops({op(convert(i^2,base,10))})=6 then f := [op(f),i] fi; od; f;
%t A054034 Select[Range[700],Count[DigitCount[#^2],0]==4&] (* _Harvey P. Dale_, May 10 2021 *)
%Y A054034 Cf. A016069, A054031, A054032, A054033, A054035, A054036, A054037, A054038, A054039.
%K A054034 nonn,base
%O A054034 1,1
%A A054034 _Asher Auel_, Feb 29 2000