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A050723
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Decimal expansion of 2^n contains no pair of consecutive equal digits (probably finite).
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4
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 20, 21, 22, 28, 29, 30, 31, 32, 34, 35, 36, 37, 48, 54, 55, 56, 66, 67, 68, 69, 80, 87, 104, 126
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| No further terms up to 5000. [From Harvey P. Dale, Dec 24 2011]
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EXAMPLE
| 2^126 = 85070591730234615865843651857942052864.
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MATHEMATICA
| Select[Range[0, 10000], !MemberQ[Differences[IntegerDigits[2^#]], 0]&] (* From Harvey P. Dale, Dec 24 2011 *)
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CROSSREFS
| Cf. A043096, A007377, A046260, A046268.
Sequence in context: A032965 A033067 A032512 * A017908 A044965 A044827
Adjacent sequences: A050720 A050721 A050722 * A050724 A050725 A050726
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Sep 15 1999.
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