OFFSET
0,2
LINKS
T. D. Noe, Table of n, a(n) for n = 0..200
MATHEMATICA
Table[If[GCD[n, 10] > 1, 0, k = MultiplicativeOrder[10, 9*n]; (10^k - 1)/(9*n)], {n, 1, 51, 2}] (* T. D. Noe, Sep 11 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 11 2012
STATUS
approved