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A346597
Partial sums of A019554.
2
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
1,2
LINKS
FORMULA
a(n) = Sum_{k=1..n} A019554(k) ~ 3*zeta(3)*n^2 / Pi^2. - Vaclav Kotesovec, Sep 18 2020 [Copied from A019554]
PROG
(PARI) a(n) = sum(k=1, n, k/core(k, 1)[2]); \\ Michel Marcus, Jul 27 2021
CROSSREFS
Cf. A019554.
Sequence in context: A090961 A073355 A067440 * A108161 A263349 A352319
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 27 2021
STATUS
approved