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 A136849 #7 Apr 12 2024 09:51:26 %S A136849 0,1,6,10,60,100,600,1000,6000,8131,10000,10301,10631,10801,31801, %T A136849 60000,60306,81310,100000,103010,103131,106310,108010,116881,136631, %U A136849 318010,600000,603060,813100,1000000,1003001,1008001,1030100,1031310,1063100,1080100,1080801,1086881,1168810,1366310,1366881,3168381,3180100,6000000,6003006 %N A136849 Numbers k such that k and k^2 use only the digits 0, 1, 3, 6 and 8. %C A136849 Generated with DrScheme. %H A136849 Jonathan Wellons, <a href="/A136849/b136849.txt">Table of n, a(n) for n = 1..655</a> %H A136849 J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived] %e A136849 813131601668131^2 = 661183001631380060861861033161. %K A136849 base,nonn %O A136849 1,3 %A A136849 Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008