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 A136817 #7 Apr 12 2024 09:51:26 %S A136817 0,1,2,5,10,11,12,15,20,21,45,50,100,101,102,105,110,112,120,145,150, %T A136817 155,200,201,205,210,211,450,500,501,502,505,1000,1001,1002,1005,1010, %U A136817 1011,1012,1020,1021,1050,1100,1101,1102,1105,1120,1200,1201,1205,1245,1415,1450,1451,1500,1550,2000,2001,2005,2010,2011,2050,2100,2101,2110,2245,4500,5000,5001 %N A136817 Numbers k such that k and k^2 use only the digits 0, 1, 2, 4 and 5. %C A136817 Generated with DrScheme. %H A136817 Jonathan Wellons, <a href="/A136817/b136817.txt">Table of n, a(n) for n = 1..1551</a> %H A136817 J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived] %e A136817 50141245^2 = 2514144450150025. %K A136817 base,nonn %O A136817 1,3 %A A136817 Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008