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 A136814 #7 Apr 12 2024 09:51:26 %S A136814 0,1,10,11,100,101,110,111,1000,1001,1010,1011,1100,1101,1110,10000, %T A136814 10001,10010,10011,10100,10101,10110,10111,11000,11001,11010,11100, %U A136814 11101,18111,100000,100001,100010,100011,100100,100101,100110,100111,101000,101001,101010,101011,101100,101110,110000,110001,110010,110100,110101,111000,111001 %N A136814 Numbers k such that k and k^2 use only the digits 0, 1, 2, 3 and 8. %C A136814 Generated with DrScheme. %H A136814 Jonathan Wellons, <a href="/A136814/b136814.txt">Table of n, a(n) for n = 1..1410</a> %H A136814 J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived] %e A136814 3212183110101^2 = 10318120332818133088230201. %K A136814 base,nonn %O A136814 1,3 %A A136814 Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008