A290988 The arithmetic function v+-(n,3).

1, 1, 2, 1, 3, 1, 4, 3, 5, 3, 6, 3, 7, 5, 8, 5, 9, 5, 10, 7, 11, 7, 12, 7, 13, 9, 14, 9, 15, 9, 16, 11, 17, 11, 18, 11, 19, 13, 20, 13, 21, 13, 22, 15, 23, 15, 24, 15, 25, 17, 26, 17, 27, 17, 28, 19, 29, 19, 30, 19, 31, 21, 32, 21, 33, 21, 34, 23, 35

Offset: 2

Author

Robert Price, Aug 16 2017

Keywords

• nonn

Links

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

Crossrefs

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

Programs

Mathematica

vpm[n_, h_] := (d = Divisors[n]; Max[(2*Floor[(d - 2)/(2*h)] + 1)*n/d]); Table[vpm[n, 3], {n, 2, 70}]