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

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

%S 0,1,6,10,60,100,600,1000,6000,10000,10301,60000,100000,103010,103131,

%T 600000,1000000,1003001,1030100,1031310,6000000,10000000,10030010,

%U 10301000,10313100,60000000,100000000,100030001,100300100,103010000,103131000,600000000,1000000000,1000300010,1003001000,1030100000,1031310000,6000000000

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

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A136847/b136847.txt">Table of n, a(n) for n = 1..77</a>

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

%e 103131^2 = 10636003161.

%K base,nonn

%O 1,3

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