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 A063540 Smallest k such that 2^k has exactly n 6's in its decimal representation. 9
 1, 4, 16, 36, 60, 100, 72, 123, 124, 161, 157, 243, 196, 230, 222, 220, 300, 323, 361, 447, 378, 551, 433, 506, 555, 565, 636, 508, 606, 662, 701, 778, 810, 746, 823, 839, 850, 977, 1074, 861, 1046, 1086, 996, 1161, 1067, 1168, 1083, 983, 1223, 1252, 1303 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Harry J. Smith, Table of n, a(n) for n = 0..150 MATHEMATICA a = {}; Do[k = 1; While[ Count[ IntegerDigits[2^k], 6] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a PROG (PARI) a(n)={my(k=1); while(n<>#select(d->d==6, digits(2^k)), k++); k} \\ Harry J. Smith, Aug 25 2009, Andrew Howroyd, Jun 26 2018 CROSSREFS Cf. A063115, A063426, A063429, A063430, A063526, A063552, A063553, A063554. Sequence in context: A174597 A044065 A281795 * A055808 A016742 A221285 Adjacent sequences:  A063537 A063538 A063539 * A063541 A063542 A063543 KEYWORD base,nonn AUTHOR Robert G. Wilson v, Aug 10 2001 EXTENSIONS Name corrected by Jon E. Schoenfield, Jun 25 2018 STATUS approved

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Last modified February 24 00:51 EST 2020. Contains 332195 sequences. (Running on oeis4.)