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 A063615 Smallest k such that 7^k has exactly n 9's in its decimal representation. 0
 1, 2, 13, 18, 22, 28, 43, 46, 71, 66, 83, 104, 86, 128, 127, 125, 139, 142, 124, 190, 195, 185, 202, 216, 215, 265, 235, 245, 244, 263, 278, 282, 274, 277, 286, 310, 320, 323, 432, 348, 376, 448, 400, 392, 459, 446, 441, 413, 587, 456, 486 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..50. MATHEMATICA a = {}; Do[k = 1; While[ Count[ IntegerDigits[7^k], 9] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a With[{sev=Table[DigitCount[7^n, 10, 9], {n, 600}]}, Table[Position[sev, i, {1}, 1], {i, 0, 50}]]//Flatten (* Harvey P. Dale, May 04 2016 *) CROSSREFS Sequence in context: A067522 A128852 A191765 * A297837 A246358 A262688 Adjacent sequences: A063612 A063613 A063614 * A063616 A063617 A063618 KEYWORD base,nonn AUTHOR Robert G. Wilson v, Aug 10 2001 EXTENSIONS Name corrected by Jon E. Schoenfield, Jun 26 2018 STATUS approved

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Last modified July 23 10:25 EDT 2024. Contains 374547 sequences. (Running on oeis4.)