OFFSET
0,1
COMMENTS
See A176767 for the actual powers 7^a(n). - M. F. Hasler, Oct 03 2014
MATHEMATICA
Table[k = 0; While[ StringPosition[ ToString[7^k], ToString[n] ] == {}, k++ ]; k, {n, 0, 75} ]
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Robert G. Wilson v, Jun 24 2001
STATUS
approved