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

%I #10 Apr 16 2024 13:56:06

%S 1,5,11,15

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

%C Sequence terminates.

%C Generated with DrScheme.

%C Numbers appearing in A131082; subsequence of A031153, A137003. - _M. F. Hasler_, Jan 24 2008

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

%e 15^2 = 225.

%Y Cf. A031153, A131082, A136986, A137003.

%K base,fini,full,nonn

%O 1,2

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