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%I #20 Feb 19 2024 01:55:46
%S 6,10,17,25,36,42,50,59,60,61,72,73,78,79,81,84,86,87,89,92,93,95,96,
%T 160,200,212,222,225,227,239,260,261,269,290,291,296,300,301,304,311,
%U 313,315,324,326,327,330,336,344,345,348,350,355,362,372,378,379,381
%N Numbers k such that k is a substring of 4^k.
%H Robert Israel, <a href="/A049302/b049302.txt">Table of n, a(n) for n = 1..10000</a>
%Y Cf. A000302, A032740, A049301-A049307.
%Y Includes A288845.
%K nonn,base,easy
%O 1,1
%A _David W. Wilson_
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