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A063554
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Smallest power of 2 having just n 9's in its decimal representation.
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0
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1, 12, 34, 32, 83, 53, 92, 139, 93, 172, 173, 244, 254, 335, 342, 332, 333, 415, 356, 434, 506, 473, 477, 476, 517, 532, 596, 643, 662, 673, 731, 729, 603, 735, 850, 793, 792, 966, 959, 961, 1043, 1129, 1131, 1159, 1153, 1077, 1157, 1241, 1078, 1328
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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MATHEMATICA
| a = {}; Do[k = 1; While[ Count[ IntegerDigits[2^k], 9] != n, k++ ]; a = Append[a, k], {n, 0, 50} ]; a
n9[n_]:=Module[{k=1}, While[DigitCount[2^k, 10, 9]!=n, k++]; k]; Array[n9, 50, 0] (* From Harvey P. Dale, Dec 17 2011 *)
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CROSSREFS
| Sequence in context: A043941 A117476 A122436 * A059805 A141694 A077295
Adjacent sequences: A063551 A063552 A063553 * A063555 A063556 A063557
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KEYWORD
| base,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 10 2001
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