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%I #11 May 10 2024 08:51:28
%S 1,2,11,12,21,212,221911
%N Numbers k such that k and k^2 use only the digits 1, 2, 4 and 9.
%C Generated with DrScheme.
%H Jonathan Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived]
%e 221911^2 = 49244491921.
%K base,nonn,more
%O 1,2
%A Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
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