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 A063596 Least k >= 0 such that 6^k has exactly n 0's in its decimal representation. 11
 0, 10, 9, 13, 19, 43, 56, 41, 94, 79, 113, 100, 88, 112, 124, 127, 138, 176, 144, 175, 174, 168, 170, 210, 245, 228, 182, 237, 287, 260, 312, 321, 294, 347, 389, 365, 401, 386, 390, 419, 460, 425, 438, 426, 488, 490, 520, 458, 489, 521, 513 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS MATHEMATICA a = {}; Do[k = 0; While[ Count[ IntegerDigits[6^k], 0] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a With[{pwr6=Table[{n, DigitCount[6^n, 10, 0]}, {n, 1000}]}, Join[{0}, Transpose[ Table[ SelectFirst[pwr6, #[[2]]==i&], {i, 60}]][[1]]]] (* Harvey P. Dale, Dec 15 2014 *) PROG (PARI) A063596(n)=for(k=0, oo, #select(d->!d, digits(6^k))==n&&return(k)) \\ M. F. Hasler, Jun 14 2018 CROSSREFS Cf. A031146 (analog for 2^k), A063555 (for 3^k), A063575 (for 4^k), A063585 (for 5^k), A063606 (for 7^k), A063616 (for 8^k), A063626 (for 9^k). Sequence in context: A063661 A154533 A167608 * A284518 A309660 A184959 Adjacent sequences:  A063593 A063594 A063595 * A063597 A063598 A063599 KEYWORD base,nonn AUTHOR Robert G. Wilson v, Aug 10 2001 EXTENSIONS a(0) changed to 0 (as in A031146, A063555, ...) and better title from M. F. Hasler, Jun 14 2018 STATUS approved

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Last modified January 28 06:29 EST 2020. Contains 331317 sequences. (Running on oeis4.)