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A050723 Decimal expansion of 2^n contains no pair of consecutive equal digits (probably finite). 4
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; text; internal format)
OFFSET

0,3

COMMENTS

No further terms up to 100000. - T. D. Noe, Sep 18 2012

LINKS

Table of n, a(n) for n=0..40.

EXAMPLE

2^126 = 85070591730234615865843651857942052864.

MATHEMATICA

Select[Range[0, 10000], !MemberQ[Differences[IntegerDigits[2^#]], 0]&] (* Harvey P. Dale, Dec 24 2011 *)

CROSSREFS

Cf. A043096, A007377, A046260, A046268.

Sequence in context: A032965 A033067 A032512 * A017908 A044965 A044827

Adjacent sequences:  A050720 A050721 A050722 * A050724 A050725 A050726

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Sep 15 1999.

STATUS

approved

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Last modified December 8 14:38 EST 2016. Contains 278945 sequences.