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 A136892 #9 Apr 12 2024 09:51:26
%S A136892 0,6,26,60,260,600,606,2600,6000,6006,6060,26000,60000,60006,60060,
%T A136892 60600,260000,270606,600000,600006,600060,600600,606000,2600000,
%U A136892 2603326,2706060,6000000,6000006,6000060,6000600,6000606,6006000,6060000,6060006,26000000,26033260,27060600,60000000,60000006,60000060,60000600,60000606,60006000
%N A136892 Numbers k such that k and k^2 use only the digits 0, 2, 3, 6 and 7.
%C A136892 Generated with DrScheme.
%H A136892 Jonathan Wellons, <a href="/A136892/b136892.txt">Table of n, a(n) for n = 1..558</a>
%H A136892 J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived]
%e A136892 600306307363726^2 = 360367662660672272772060603076.
%t A136892 With[{c={0,2,3,6,7}},Select[FromDigits/@Tuples[c,8],SubsetQ[ c, IntegerDigits[ #^2]]&]] (* _Harvey P. Dale_, Mar 01 2020 *)
%K A136892 base,nonn
%O A136892 1,2
%A A136892 Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008