



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
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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



