OFFSET
1,2
COMMENTS
Comparing with A165722 there is one additional term a(8)=9.
No other terms below 10^5.
PROG
(PARI) isok(n) = (sumdigits(16^n-1) % n) == 0; \\ Michel Marcus, Oct 16 2013
CROSSREFS
KEYWORD
base,more,nonn
AUTHOR
Zak Seidov, Sep 25 2009
STATUS
approved