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A335153 a(1)=0; thereafter a(n) = (n-1)*sigma(n)-n*sigma(n-1) where sigma is the sum-of-divisors function A000203. 1
0, 1, -1, 5, -11, 24, -36, 41, -31, 32, -78, 164, -196, 116, -24, 81, -239, 339, -381, 398, -242, 52, -300, 804, -756, 244, -94, 392, -784, 1188, -1272, 929, -543, 150, -258, 1457, -1999, 776, -212, 1270, -2010, 2172, -2280, 1676, -348, -348, -1176, 3524, -3340, 1707, -1143, 1254, -2386, 3444, -2712, 2568, -2360, 490 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

N. J. A. Sloane, Table of n, a(n) for n = 1..10000

CROSSREFS

Sequence in context: A065114 A309730 A102171 * A122926 A122925 A021008

Adjacent sequences:  A335150 A335151 A335152 * A335154 A335155 A335156

KEYWORD

sign

AUTHOR

N. J. A. Sloane, May 30 2020

STATUS

approved

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Last modified August 8 08:27 EDT 2020. Contains 336293 sequences. (Running on oeis4.)