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A050725
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Decimal expansion of 4^n contains no pair of consecutive equal digits (probably finite).
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1
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0, 1, 2, 3, 4, 5, 6, 7, 10, 11, 14, 15, 16, 17, 18, 24, 27, 28, 33, 34, 40, 52, 63
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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COMMENTS
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No additional terms up to 1200 -- From Harvey P. Dale, Mar 30 2011.
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LINKS
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Table of n, a(n) for n=0..22.
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EXAMPLE
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4^63 = 85070591730234615865843651857942052864.
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MATHEMATICA
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ncdQ[n_]:=And@@(First[#]!=Last[#]&/@Partition[ IntegerDigits[4^n], 2, 1]); Select[Range[0, 1000], ncdQ] (* From Harvey P. Dale, Mar 30 2011 *)
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CROSSREFS
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Cf. A030701, A046262, A046270.
Sequence in context: A001751 A191927 A116000 * A080571 A165805 A165722
Adjacent sequences: A050722 A050723 A050724 * A050726 A050727 A050728
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KEYWORD
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nonn,base
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AUTHOR
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Patrick De Geest, Sep 15 1999.
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STATUS
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approved
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