1,2

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

No other terms below 10^5.

Table of n, a(n) for n=1..22.

(PARI) isok(n) = (sumdigits(16^n-1) % n) == 0; \\ Michel Marcus, Oct 16 2013

Cf. A165722.

Sequence in context: A063949 A073518 A144769 * A033104 A191325 A190209

Adjacent sequences: A165734 A165735 A165736 * A165738 A165739 A165740

base,more,nonn

Zak Seidov, Sep 25 2009

approved