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Numbers k such that k and k^2 use only the digits 0, 1, 6 and 8.
1

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

%S 0,1,10,100,1000,10000,10801,100000,108010,1000000,1008001,1080100,

%T 10000000,10080010,10801000,100000000,100080001,100800100,108010000,

%U 1000000000,1000800010,1008001000,1080100000,10000000000,10000800001,10008000100,10080010000,10801000000,100000000000,100008000010,100080001000,100800100000

%N Numbers k such that k and k^2 use only the digits 0, 1, 6 and 8.

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A136878/b136878.txt">Table of n, a(n) for n = 1..52</a>

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

%e 108010000000000^2 = 11666160100000000000000000000.

%K base,nonn

%O 1,3

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