|
| |
|
|
A160664
|
|
a(n) = a(n-1) + A000203(n), a(0)=1.
|
|
1
| |
|
|
1, 2, 5, 9, 16, 22, 34, 42, 57, 70, 88, 100, 128, 142, 166, 190, 221, 239, 278, 298, 340, 372, 408, 432, 492, 523, 565, 605, 661, 691, 763, 795, 858, 906, 960, 1008, 1099, 1137, 1197, 1253, 1343, 1385, 1481
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,2
|
|
|
LINKS
| Charles R Greathouse IV, Table of n, a(n) for n = 0..10000
|
|
|
FORMULA
| a(n)=1+A024916(n). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 25 2009]
|
|
|
MATHEMATICA
| lst = {1}; a = 1; Do[a = a + DivisorSigma[1, n]; AppendTo[lst, a], {n, 80}]; lst (* Carl Najafi, Aug 21 2011 *)
|
|
|
PROG
| (PARI) a(n)=1+sum(k=1, n, sigma(k)) \\ Charles R Greathouse IV, Aug 22 2011
|
|
|
CROSSREFS
| Cf. A054519
Sequence in context: A054253 A045649 A024519 * A072829 A169740 A138226
Adjacent sequences: A160661 A160662 A160663 * A160665 A160666 A160667
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Ctibor O. Zizka (c.zizka(AT)email.cz), May 22 2009
|
|
|
EXTENSIONS
| More terms from Carl Najafi (carlnajafi(AT)gmail.com), Aug 21 2011
|
| |
|
|
