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Numbers k such that k and k^2 use only the digits 0, 1, 5, 6 and 9.
1

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

%S 0,1,10,100,1000,10000,10916,100000,109119,109160,956619,1000000,

%T 1091190,1091600,9566190,9569199,9959501,10000000,10911900,10916000,

%U 95661699,95661900,95691990,99595010,100000000,109091666,109119000,109160000,956616990,956619000,956919900,995950100,1000000000,1056690916,1090916660

%N Numbers k such that k and k^2 use only the digits 0, 1, 5, 6 and 9.

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A136871/b136871.txt">Table of n, a(n) for n = 1..205</a>

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

%e 956590595061969^2 = 915065566561011950166950156961.

%K base,nonn

%O 1,3

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