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A067488
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Powers of 2 with initial digit 1.
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10
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1, 16, 128, 1024, 16384, 131072, 1048576, 16777216, 134217728, 1073741824, 17179869184, 137438953472, 1099511627776, 17592186044416, 140737488355328, 1125899906842624, 18014398509481984, 144115188075855872
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Also smallest n-digit power of 2.
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FORMULA
| a(n) = 2^ceil(log(10)/log(2)*n). - Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 29 2002
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MATHEMATICA
| Select[2^Range[0, 70], First[IntegerDigits[#]]==1&] (* From Harvey P. Dale, Mar 14 2011 *)
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CROSSREFS
| Cf. A067480, A067481, A067482, A067483, A067484, A067485, A067486.
Cf. A074116, A074117, A074118.
Sequence in context: A128692 A132136 A163399 * A120785 A031156 A099195
Adjacent sequences: A067485 A067486 A067487 * A067489 A067490 A067491
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KEYWORD
| base,easy,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 09 2002
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