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Numbers k such that k and k^2 use only the digits 0, 2, 3, 5 and 6.
1

%I #7 Apr 12 2024 09:51:26

%S 0,5,6,25,50,55,60,225,235,250,255,256,500,505,506,550,566,600,605,

%T 2250,2350,2500,2550,2560,5000,5005,5006,5025,5050,5055,5060,5500,

%U 5505,5525,5535,5660,6000,6005,6025,6050,6055,22500,22506,23500,23506,23566,23665,25000,25005,25006,25025,25225,25500,25505,25506,25535,25566,25600,50000,50005

%N Numbers k such that k and k^2 use only the digits 0, 2, 3, 5 and 6.

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A136888/b136888.txt">Table of n, a(n) for n = 1..1151</a>

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

%e 503620256^2 = 253633362253505536.

%K base,nonn

%O 1,2

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