%I

%S 1,2,3,4,5,6,7,9,10,12,13,14,17,18,23,37,43,46,60,119,183,223

%N Positive integers n such that the sum of decimal digits of (16^n-1) is divisible by n.

%C Comparing with A165722 there is one additional term a(8)=9.

%C No other terms below 10^5.

%o (PARI) isok(n) = (sumdigits(16^n-1) % n) == 0; \\ _Michel Marcus_, Oct 16 2013

%Y Cf. A165722.

%K base,more,nonn

%O 1,2

%A _Zak Seidov_, Sep 25 2009