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Search: id:A159913
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| 1, 3, 3, 7, 3, 7, 7, 15, 3, 7, 7, 15, 7, 15, 15, 31, 3, 7, 7, 15, 7, 15, 15, 31, 7, 15, 15, 31, 15, 31, 31, 63, 3, 7, 7, 15, 7, 15, 15, 31, 7, 15, 15, 31, 15, 31, 31, 63, 7, 15, 15, 31, 15, 31, 31, 63, 15, 31, 31, 63, 31, 63, 63, 127, 3, 7, 7, 15, 7, 15, 15, 31, 7, 15, 15, 31, 15, 31, 31
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Essentially the same sequence as A117973 and A001316. The latter entry has much more information. - N. J. A. Sloane, Jun 05 2009
First differences of A159912; every other term of A038573.
Contribution from Gary W. Adamson (qntmpkt(AT)yahoo.com), Oct 16 2009: (Start)
Equals Sierpinski's gasket, A047999; as an infinite lower triangular matrix
* [1,2,2,2,...] as a vector. (End)
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FORMULA
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a(n) = 2^A000120(2n+1)-1 = A038573(2n+1) = 2 A038573(n)+1 = A159912(n+1) - A159912(n)
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PROGRAM
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(PARI) A159913(n)=2<<norml2(binary(n))-1
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CROSSREFS
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Rows of triangle in A038573 converge to this sequence. - N. J. A. Sloane, Jun 05 2009
Cf. A000120, A038573, A159912, A117973, A001316.
A047999 [From Gary W. Adamson (qntmpkt(AT)yahoo.com), Oct 16 2009]
Sequence in context: A096915 A100803 A036840 this_sequence A030316 A034257 A145501
Adjacent sequences: A159910 A159911 A159912 this_sequence A159914 A159915 A159916
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KEYWORD
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nonn
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AUTHOR
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M. F. Hasler (MHasler(AT)univ-ag.fr), May 03 2009
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