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Numbers k such that k and k^2 use only the digits 1, 4, 7 and 8.
0

%I #9 May 10 2024 10:59:31

%S 1,88,4141,8878

%N Numbers k such that k and k^2 use only the digits 1, 4, 7 and 8.

%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 4141^2 = 17147881.

%K base,nonn,more

%O 1,2

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