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Search: id:A104515
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| A104515 |
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Difference between the maximum number of consecutive integers and the least number >1 of consecutive integers, the sum of which equals 2n. |
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+0
5
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| 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 3, 0, 0, 1, 0, 0, 4, 0, 0, 0, 3, 0, 4, 0, 0, 2, 0, 0, 4, 0, 5, 5, 0, 0, 4, 0, 0, 4, 0, 0, 7, 0, 0, 0, 5, 1, 4, 0, 0, 6, 8, 0, 4, 0, 0, 5, 0, 0, 7, 0, 8, 8, 0, 0, 4, 3, 0, 6, 0, 0, 8, 0, 9, 9, 0, 0, 7, 0, 0, 5, 8, 0, 4, 0, 0, 9, 11, 0, 4, 0, 8, 0, 0, 3, 9, 3, 0, 9, 0, 0
(list; graph; listen)
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OFFSET
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1,15
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COMMENT
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a(n)=0 iff n=2^k.
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REFERENCES
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Alfred S. Posamentier, Math Charmers, Tantalizing Tidbits for the Mind, Prometheus Books, NY, 2003, page 67.
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EXAMPLE
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a(18) = 1 because 3+4+5+6 = 5+6+7 = 18.
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MATHEMATICA
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f[n_] := Block[{r = Ceiling[n/2]}, If[ IntegerQ[ Log[2, n]], 0, m = Range[r]; lst = Flatten[ Table[ m[[k]], {i, r}, {j, i + 1, r}, {k, i, j}], 1]; l = Length /@ lst[[ Flatten[ Position[ Plus @@@ lst, n]]]]; Max[l] - Min[l]]]; Table[ f[2n], {n, 105}]
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CROSSREFS
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Cf. A104512, A104513, A104514, A104516.
Sequence in context: A091009 A167163 A005890 this_sequence A074936 A035655 A036857
Adjacent sequences: A104512 A104513 A104514 this_sequence A104516 A104517 A104518
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KEYWORD
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nonn
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AUTHOR
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Alfred S. Posamentier (asp2(AT)juno.com) and Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 23 2005
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