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Numbers k such that k and k^2 use only the digits 2, 3, 5, 7 and 8.
1

%I #8 Apr 12 2024 09:51:27

%S 5,85,235,885,2885,7585,22885,27885,72335,73385,75885,87885,287885,

%T 522335,572585,723385,723585,733385,852835,2352835,2752885,2885885,

%U 5222335,5222885,5223335,5232385,5327835,5772585,5777835,7272385,7333385,8852885,23575885,28858835,53223335,73333385,85752885,88787885,275378335,278527885

%N Numbers k such that k and k^2 use only the digits 2, 3, 5, 7 and 8.

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A137083/b137083.txt">Table of n, a(n) for n = 1..183</a>

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

%e 723728372752885^2 = 523782757527538855273275823225.

%K base,nonn

%O 1,1

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