login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

Numbers k such that k and k^2 use only the digits 0, 1, 3, 6 and 9.
1

%I #7 Apr 12 2024 09:51:26

%S 0,1,3,6,10,13,19,30,31,60,63,100,103,130,190,199,300,301,306,310,369,

%T 600,603,630,1000,1003,1030,1300,1900,1990,1999,3000,3001,3006,3010,

%U 3060,3100,3690,6000,6003,6030,6300,10000,10003,10030,10300,10301,13000,19000,19900,19990,19999,30000,30001,30006,30010,30060,30100,30103,30600,31000,31131

%N Numbers k such that k and k^2 use only the digits 0, 1, 3, 6 and 9.

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A136850/b136850.txt">Table of n, a(n) for n = 1..1113</a>

%H J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived]

%e 310960393031^2 = 96696366033993993366961.

%K base,nonn

%O 1,3

%A Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008