A125518 a(n) = tau(n) * prime(n).

2, 6, 10, 21, 22, 52, 34, 76, 69, 116, 62, 222, 82, 172, 188, 265, 118, 366, 134, 426, 292, 316, 166, 712, 291, 404, 412, 642, 218, 904, 254, 786, 548, 556, 596, 1359, 314, 652, 668, 1384, 358, 1448, 382, 1158, 1182, 796, 422, 2230, 681, 1374, 932, 1434, 482

Offset

1,1

Links

Andrew Howroyd, Table of n, a(n) for n = 1..1000

Mathematica

Table[DivisorSigma[0, n]Prime[n], {n, 60}] (* Harvey P. Dale, Feb 19 2021 *)

Prog

(PARI) a(n) = numdiv(n) * prime(n); \\ Andrew Howroyd, Aug 09 2018

Crossrefs

Row sums of A127641.

Cf. A000005 (tau), A000040 (prime).

Cf. A127640, A127638, A127639.

Sequence in context: A192390 A272967 A067716 * A083176 A103628 A207382

Adjacent sequences: A125515 A125516 A125517 * A125519 A125520 A125521

Keyword

nonn,easy

Author

Gary W. Adamson, Jan 21 2007

Extensions

Name changed and terms a(15) and beyond from Andrew Howroyd, Aug 09 2018

Status

approved