A136822 - OEIS

A136822

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

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

%S 0,1,5,10,11,15,50,100,101,105,110,150,500,501,505,1000,1001,1005,

%T 1010,1011,1050,1100,1101,1105,1500,5000,5001,5005,5010,5011,5015,

%U 5050,10000,10001,10005,10010,10011,10050,10100,10105,10110,10500,11000,11001,11005,11010,11050,11205,15000,15005,50000,50001,50005,50010,50011,50015,50050,50100

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

%C Generated with DrScheme

%H Jonathan Wellons, <a href="/A136822/b136822.txt">Table of n, a(n) for n = 1..1165</a>

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

%e 5010102005^2 = 25101122100505020025.

%K base,nonn

%O 1,3

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