|
Search: id:A061503
|
|
|
| A061503 |
|
Sum_{k<=n} (tau(k^2)), where tau = sum of divisors function A000005. |
|
+0
3
|
|
| 1, 4, 7, 12, 15, 24, 27, 34, 39, 48, 51, 66, 69, 78, 87, 96, 99, 114, 117, 132, 141, 150, 153, 174, 179, 188, 195, 210, 213, 240, 243, 254, 263, 272, 281, 306, 309, 318, 327, 348, 351, 378, 381, 396, 411, 420, 423, 450, 455, 470, 479, 494, 497
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
REFERENCES
|
Mentioned by S. R. Finch (Steven.Finch(AT)inria.fr) in a posting to the Number Theory List (NMBRTHRY(AT)LISTSERV.NODAK.EDU), Jun 13 2001.
|
|
LINKS
|
Kevin A. Broughan, Restricted divisor sums, Acta Arithmetica, vol. 101, (2002), pp. 105-114.
|
|
FORMULA
|
a(n) = Sum_{1<=j<=n^2} (floor(n/A019554(j))), - Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), Jul 20 2002
|
|
CROSSREFS
|
Cf. A000005, A061502. Partial sums of A048691.
Sequence in context: A049509 A026360 A047535 this_sequence A134659 A075624 A008333
Adjacent sequences: A061500 A061501 A061502 this_sequence A061504 A061505 A061506
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
njas, Jun 14 2001
|
|
|
Search completed in 0.002 seconds
|
