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A291328 The arithmetic function v+-(n,9). 0
1, 1, 2, 1, 3, 1, 4, 3, 5, 1, 6, 1, 7, 5, 8, 1, 9, 1, 10, 7, 11, 3, 12, 5, 13, 9, 14, 3, 15, 3, 16, 11, 17, 7, 18, 3, 19, 13, 20, 5, 21, 5, 22, 15, 23, 5, 24, 7, 25, 17, 26, 5, 27, 11, 28, 19, 29, 7, 30, 7, 31, 21, 32, 13, 33, 7, 34, 23, 35 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,3

LINKS

Table of n, a(n) for n=2..70.

Bela Bajnok, Additive Combinatorics: A Menu of Research Problems, arXiv:1705.07444 [math.NT], May 2017. See Section 1.6.2.

MATHEMATICA

vpm[n_, h_] := (d = Divisors[n]; Max[(2*Floor[(d - 2)/(2*h)] + 1)*n/d]); Table[vpm[n, 9], {n, 2, 70}]

CROSSREFS

Cf. A289435, A289436, A289437, A289438, A289439, A289440, A289441, A290988.

Sequence in context: A032742 A060654 A291329 * A280497 A280495 A302042

Adjacent sequences:  A291325 A291326 A291327 * A291329 A291330 A291331

KEYWORD

nonn

AUTHOR

Robert Price, Aug 22 2017

STATUS

approved

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Last modified December 13 19:41 EST 2018. Contains 318087 sequences. (Running on oeis4.)