A176708 Partial sums of A094820.

1, 3, 6, 11, 17, 25, 34, 45, 58, 73, 89, 108, 128, 150, 174, 201, 229, 260, 292, 327, 364, 403, 443, 487, 533, 581, 631, 684, 738, 796, 855, 917, 981, 1047, 1115, 1188, 1262, 1338, 1416, 1498, 1581, 1668, 1756, 1847, 1941, 2037, 2134, 2236, 2340, 2447, 2556

Offset: 1

Author

Jonathan Vos Post, Apr 24 2010

Keywords

• easy
• nonn

Crossrefs

Cf. A038548, A094820.

Programs

PARI

f(n) = sum(k=1, n, ceil(numdiv(k)/2)); \\ A094820
a(n) = sum(k=1, n, f(k)); \\ Michel Marcus, Sep 29 2021

Extensions

a(2) corrected by Georg Fischer, Sep 29 2021