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 A136948 #7 Apr 12 2024 09:51:27 %S A136948 0,74,76,740,760,7400,7600,74000,74476,76000,77766,667574,740000, %T A136948 744760,757666,760000,777660,777666,6675740,7075076,7400000,7447600, %U A136948 7576660,7600000,7776600,7776660,66757400,67577766,67607474,70750760,74000000,74474476,74476000,74476574,75765474,75766600,76000000,77750074,77766000,77766600,667574000 %N A136948 Numbers k such that k and k^2 use only the digits 0, 4, 5, 6 and 7. %C A136948 Generated with DrScheme. %H A136948 Jonathan Wellons, <a href="/A136948/b136948.txt">Table of n, a(n) for n = 1..306</a> %H A136948 J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived] %e A136948 676577456545476^2 = 457757054705545465075656066576. %K A136948 base,nonn %O A136948 1,2 %A A136948 Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008