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A143274 a(n) = n * A006218(n). 1
1, 6, 15, 32, 50, 84, 112, 160, 207, 270, 319, 420, 481, 574, 675, 800, 884, 1044, 1140, 1320, 1470, 1628, 1748, 2016, 2175, 2366, 2565, 2828, 2987, 3330, 3503, 3808, 4059, 4318, 4585, 5040, 5254, 5548, 5850, 6320, 6560, 7056, 7310, 7744, 8190, 8556, 8836 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..47.

FORMULA

a(n) = n * A006218(n), where A006218(n) = partial sums of d(n). Equals row sums of triangle A143273.

EXAMPLE

a(4) = 32 = 4 * A006218(4), where A006218 = (1, 3, 5, 8, 10,...).

a(4) = 32 = sum of row 4 terms of triangle A143273: (4 + 8 + 8 + 12).

PROG

(PARI) a(n) = n*sum(k=1, n, n\k); \\ Michel Marcus, Mar 19 2016

CROSSREFS

Cf. A000005, A006218, A143273.

Sequence in context: A134506 A273117 A273689 * A273332 A273427 A273764

Adjacent sequences:  A143271 A143272 A143273 * A143275 A143276 A143277

KEYWORD

nonn

AUTHOR

Gary W. Adamson, Aug 03 2008

EXTENSIONS

More terms from Eric M. Schmidt, Feb 28 2014

STATUS

approved

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Last modified December 7 00:09 EST 2019. Contains 329812 sequences. (Running on oeis4.)