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Numbers k such that k and k^2 use only the digits 1, 2, 3, 5 and 9.
1

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

%S 1,3,5,11,15,23,35,39,111,115,123,139,235,315,335,1235,1239,1515,1523,

%T 2315,3335,3515,3911,11515,12335,13911,15911,23515,23523,31515,33335,

%U 33515,95511,95515,123335,123515,123911,151523,159139,231515,333335,333515,353911,593239,1122139,1151239,1233335,1233515,1523523,1591515,1592235,1593523

%N Numbers k such that k and k^2 use only the digits 1, 2, 3, 5 and 9.

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A136977/b136977.txt">Table of n, a(n) for n = 1..423</a>

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

%e 592921515323515^2 = 351555923333533232955111955225.

%K base,nonn

%O 1,2

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