OFFSET
0,2
LINKS
Harry J. Smith, Table of n, a(n) for n = 0..150
MATHEMATICA
a = {}; Do[k = 1; While[ Count[ IntegerDigits[3^k], 9] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a
PROG
(PARI) a(n)={my(k=1); while(n<>#select(d->d==9, digits(3^k)), k++); k} \\ Harry J. Smith, Aug 26 2009, Andrew Howroyd, Jun 28 2018
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Robert G. Wilson v, Aug 10 2001
EXTENSIONS
Name corrected by Jon E. Schoenfield, Jun 26 2018
STATUS
approved