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Numbers k such that k and k^2 use only the digits 0, 4, 5, 6 and 8.
1

%I #7 Apr 12 2024 09:51:27

%S 0,8,80,800,8000,80000,80408,800000,804080,6844008,8000000,8040800,

%T 8066008,68440080,80000000,80408000,80650508,80660080,684400800,

%U 800000000,804080000,806505080,806600800,6844008000,8000000000,8040800000,8065050800,8066008000,68440080000,80000000000,80405566008,80408000000,80650508000

%N Numbers k such that k and k^2 use only the digits 0, 4, 5, 6 and 8.

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A136949/b136949.txt">Table of n, a(n) for n = 1..83</a>

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

%e 804080645865008^2 = 646545685054688406888558840064.

%K base,nonn

%O 1,2

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