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Search: id:A145015
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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; listen)
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OFFSET
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0,2
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COMMENT
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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
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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
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Cf. A037861.
Sequence in context: A117572 A029153 A060241 this_sequence A085723 A165027 A078555
Adjacent sequences: A145012 A145013 A145014 this_sequence A145016 A145017 A145018
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KEYWORD
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base,nonn
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AUTHOR
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Denis Boigelot (dboigelo(AT)ulb.ac.be), Sep 29 2008
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