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A145015
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Run lengths in A037861 having the same sign.
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0
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1, 3, 1, 3, 3, 5, 3, 1, 1, 3, 1, 7, 7, 1, 3, 5, 3, 13, 7, 1, 3, 1, 1, 3, 3, 1, 1, 3, 1, 7, 3, 1, 1, 3, 1, 7, 1, 15, 15, 1, 7, 1, 3, 5, 7, 1, 3, 5, 3, 13, 7, 1, 3, 5, 3, 13, 3, 29, 15, 1, 7, 1, 3, 1, 1, 3, 7, 1, 3, 1, 1, 3, 3, 1, 1, 3, 1, 7, 7, 1, 3, 1, 1, 3, 3, 1, 1, 3, 1, 7, 3, 1, 1, 3, 1, 7, 1, 15, 7, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| a(n) seems (conjecture) to contain only the numbers 2^n - 1 (for n>=1) and 2^n - 3 (for n>=3)
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EXAMPLE
| A037861 is: 1,-1,0,-2,1,-1,-1,-3,2,0,0,-2,0,-2,-2,-4,3, ... so sign is +,-,0,-,+,-,-,-,+,0,0,-,0,-,-,-,+, ... thus sequence is 1,3,1,3,3,5, ...
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CROSSREFS
| Cf. A037861.
Sequence in context: A117572 A029153 A060241 * A085723 A186422 A165027
Adjacent sequences: A145012 A145013 A145014 * A145016 A145017 A145018
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KEYWORD
| base,nonn
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AUTHOR
| Denis Boigelot (dboigelo(AT)ulb.ac.be), Sep 29 2008
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