1,2

Table of n, a(n) for n=1..84.

Jorge Luis Cimadevilla Villacorta, Certain inequalities associated with the divisor function, Amer. Math. Monthly, 120 (2013), 832-837. (Shows that a(n) >= 0.)

See A230290.

(PARI) vector(100, n, sum(i=1, n, numdiv(24*i+17)) - sum(i=1, n, numdiv(6*i+5))) \\ Michel Marcus, Oct 09 2014

Cf. A000005, A230290-A230296.

Sequence in context: A264136 A274850 A215594 * A059288 A217670 A243310

Adjacent sequences: A230288 A230289 A230290 * A230292 A230293 A230294

nonn

N. J. A. Sloane, Oct 17 2013

approved