A291328 The arithmetic function v+-(n,9).

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

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