OFFSET
0,4
LINKS
Antti Karttunen, Table of n, a(n) for n = 0..16384
FORMULA
Numerators of a(n) = Sum_{d|n} ((-1)^(d+1))/d. - Ridouane Oudra, Apr 28 2019
Numerators of coefficients in expansion of Sum_{k>=1} (-1)^(k+1) * x^k / (k * (1 - x^k)). - Ilya Gutkovskiy, Oct 03 2022
EXAMPLE
q + (1/2)*q^2 + (4/3)*q^3 + (1/4)*q^4 + (6/5)*q^5 + (2/3)*q^6 + (8/7)*q^7 + (1/8)*q^8 + (13/9)*q^9 + ...
PROG
(PARI) A098987(n) = if(0==n, 0, numerator(sumdiv(n, d, ((-1)^(d+1))/d))); \\ Antti Karttunen, May 06 2022
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, Oct 24 2004
EXTENSIONS
Data section extended up to term a(85) by Antti Karttunen, May 06 2022
STATUS
approved