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20^a(n) is smallest power of 20 beginning with n.
4

%I #6 Jan 17 2016 14:13:42

%S 0,1,5,2,9,6,46,3,53,10,50,7,17,47,77,4,34,54,84,1,31,51,61,81,8,18,

%T 38,48,68,78,98,5,25,35,45,55,75,85,95,2,22,32,42,145,52,62,72,82,92,

%U 102,9,19,29,39,142,49,59,162,69,79,89,192,99,6,16,119,26,36,139,46,149,56,66

%N 20^a(n) is smallest power of 20 beginning with n.

%H D. Mondot, <a href="/A180726/b180726.txt">Table of n, a(n) for n=1..32699</a>

%Y Cf. A180706, A180725, A180728

%K base,nonn

%O 1,3

%A _Daniel Mondot_, Sep 18 2010