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 A137067 #7 Apr 12 2024 09:51:27 %S A137067 2,5,6,25,65,66,235,256,665,666,2335,2535,6665,6666,23335,23525,23566, %T A137067 66665,66666,233335,235462,254235,255465,652244,665256,666665,666666, %U A137067 2333335,2335432,2335666,2354235,2534432,2534665,2536656,2554262,6523462,6524235,6652242,6666665,6666666,23333335,23352656,23354365,23523462,23546665 %N A137067 Numbers k such that k and k^2 use only the digits 2, 3, 4, 5 and 6. %C A137067 Generated with DrScheme. %H A137067 Jonathan Wellons, <a href="/A137067/b137067.txt">Table of n, a(n) for n = 1..329</a> %H A137067 J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived] %e A137067 254256454243235^2 = 64646344524342253236543265225. %K A137067 base,nonn %O A137067 1,1 %A A137067 Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008