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A063621
Smallest k such that 8^k has exactly n 5's in its decimal representation.
0
1, 3, 11, 13, 19, 23, 48, 36, 72, 86, 66, 67, 70, 103, 136, 123, 160, 106, 180, 154, 104, 187, 147, 211, 218, 212, 232, 255, 268, 250, 247, 230, 299, 269, 209, 331, 308, 289, 356, 345, 347, 367, 428, 393, 466, 360, 385, 493, 484, 476, 404
OFFSET
0,2
MATHEMATICA
a = {}; Do[k = 1; While[ Count[ IntegerDigits[8^k], 5] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a
CROSSREFS
Sequence in context: A373471 A103835 A067386 * A176870 A089152 A066594
KEYWORD
base,nonn
AUTHOR
Robert G. Wilson v, Aug 10 2001
EXTENSIONS
Name corrected by Jon E. Schoenfield, Jun 26 2018
STATUS
approved