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Search: id:A156537
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| A156537 |
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a(n), a(n+1), a(n+2), for n=2,5,8,11,... are respectively the numbers of representations of the integers 2^k-2, 2^k, 2^k+2, where k=(n+4)/3, by unordered sums of two numbers of A156284 |
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+0
6
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| 0, 0, 1, 1, 0, 1, 2, 0, 1, 2, 0, 3, 3, 0, 2, 5, 0, 4, 6, 0, 9, 19, 0, 8, 11, 0, 23, 51, 0, 27, 44, 0, 70, 207, 0, 80, 92, 0, 217, 399, 0, 279, 444, 0, 685, 1653, 0, 630, 1010, 0, 2137, 4893, 0, 3068, 3683, 0, 6855
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OFFSET
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2,7
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COMMENT
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According to the construction of A156284, a_(3n)=0, n>=1. These terms may be called "wells". The growth of the depth of the "wells" is O(2^(n/3)ln(n)/n^2).
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CROSSREFS
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Cf. A156284 A002375
Sequence in context: A025666 A025679 A071491 this_sequence A145316 A137298 A136487
Adjacent sequences: A156534 A156535 A156536 this_sequence A156538 A156539 A156540
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KEYWORD
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nonn
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AUTHOR
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Vladimir Shevelev (shevelev(AT)bgu.ac.il), Feb 09 2009, Feb 14, 2009
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Feb 14 2009
I added some terms Vladimir Shevelev (shevelev(AT)bgu.ac.il), Mar 19 2009
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