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Least positive integer k for which 9^n divides k!.
1

%I #11 Aug 28 2016 18:23:37

%S 1,6,9,15,18,24,27,30,36,39,45,48,54,54,60,63,69,72,78,81,81,87,90,96,

%T 99,105,108,111,117,120,126,129,135,135,141,144,150,153,159,162,162,

%U 168,171,177,180,186,189,192,198,201,207,210,216,216,222,225,231,234,240,243,243

%N Least positive integer k for which 9^n divides k!.

%H T. D. Noe, <a href="/A020648/b020648.txt">Table of n, a(n) for n = 0..1000</a>

%K nonn

%O 0,2

%A _David W. Wilson_