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 A136810 #8 Apr 12 2024 09:51:26 %S A136810 0,1,2,10,11,12,20,21,32,100,101,102,110,111,120,200,201,210,320,321, %T A136810 332,1000,1001,1002,1010,1011,1012,1020,1021,1100,1101,1102,1110,1111, %U A136810 1200,1201,2000,2001,2010,2011,2100,2101,3200,3210,3320,3332,10000,10001,10002,10010,10011,10012,10020,10021,10100,10101,10110,10111,10120,10200,10210,11000 %N A136810 Numbers k such that k and k^2 use only the digits 0, 1, 2, 3 and 4. %C A136810 Generated with DrScheme. %H A136810 Jonathan Wellons, <a href="/A136810/b136810.txt">Table of n, a(n) for n = 1..1754</a> %H A136810 J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived] %e A136810 3230203421^2 = 10434214141040103241. %Y A136810 Cf. A158304. %K A136810 base,nonn %O A136810 1,3 %A A136810 Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008