A346597 Partial sums of A019554.

1, 3, 6, 8, 13, 19, 26, 30, 33, 43, 54, 60, 73, 87, 102, 106, 123, 129, 148, 158, 179, 201, 224, 236, 241, 267, 276, 290, 319, 349, 380, 388, 421, 455, 490, 496, 533, 571, 610, 630, 671, 713, 756, 778, 793, 839, 886, 898, 905, 915, 966, 992, 1045, 1063, 1118, 1146, 1203, 1261, 1320, 1350, 1411

Offset: 1

Author

N. J. A. Sloane, Jul 27 2021

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A019554.

Programs

PARI

a(n) = sum(k=1, n, k/core(k, 1)[2]); \\ Michel Marcus, Jul 27 2021

Formula

a(n) = Sum_{k=1..n} A019554(k) ~ 3*zeta(3)*n^2 / Pi^2. - Vaclav Kotesovec, Sep 18 2020 [Copied from A019554]