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Search: id:A127978
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| A127978 |
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Numbers of the form ((15n + 34)/54)2^(n - 1) - ((-1)^(n - 1) )(6n + 5)/27. |
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+0
8
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| 3, 5, 15, 31, 75, 163, 367, 799, 1747, 3771, 8119, 17367, 37019, 78579, 166271, 350735, 737891, 1548587, 3242823, 6776903, 14136363, 29437795, 61205775, 127071871, 263464435, 545570203, 1128423127, 2331411639, 4811954107
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OFFSET
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1,1
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COMMENT
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In the original paper there is an error for n=1 ((15n + 34)/54)2^(n - 1) - ((-1)^(n - 1) )(6n + 5)/27 is equal 1/2 (not 1)
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REFERENCES
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Bosma W. 2001. Signed bits and fast exponentiation. J. Th. des Nombres de Bordeaux Vol.13, Fasc. 1
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LINKS
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Bosma W. Signed bits and fast exponentiation.
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FORMULA
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a(n) = ((15n + 34)/54)2^(n - 1) - ((-1)^(n - 1) )(6n + 5)/27
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MATHEMATICA
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Table[((15n + 34)/54)2^(n - 1) - ((-1)^(n - 1) )(6n + 5)/27, {n, 2, 50}] (*Artur Jasinski*)
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CROSSREFS
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Cf. A073371 A127976.
Sequence in context: A018454 A126087 A148498 this_sequence A018470 A120748 A148499
Adjacent sequences: A127975 A127976 A127977 this_sequence A127979 A127980 A127981
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Feb 09 2007
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