|
| |
|
|
A062731
|
|
Sum of divisors of 2*n.
|
|
4
| |
|
|
3, 7, 12, 15, 18, 28, 24, 31, 39, 42, 36, 60, 42, 56, 72, 63, 54, 91, 60, 90, 96, 84, 72, 124, 93, 98, 120, 120, 90, 168, 96, 127, 144, 126, 144, 195, 114, 140, 168, 186, 126, 224, 132, 180, 234, 168, 144, 252, 171, 217, 216, 210, 162, 280, 216, 248, 240, 210
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1000
|
|
|
FORMULA
| a(n)= A000203(2*n). - R. J. Mathar, Apr 06 2011
|
|
|
MATHEMATICA
| lst={}; Do[AppendTo[lst, DivisorSigma[1, n]], {n, 2, 6!, 2}]; lst [From Vladimir Orlovsky, Sep 20 2008]
|
|
|
PROG
| (PARI) vector(66, n, sigma(2*n, 1))
(MuPad) numlib::sigma(2*n)$ n=0..81 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 13 2008
(PARI) { for (n=1, 1000, write("b062731.txt", n, " ", sigma(2*n)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 09 2009]
|
|
|
CROSSREFS
| Cf. A008438, A074400.
Sequence in context: A081695 A142958 A187481 * A083031 A189927 A189403
Adjacent sequences: A062728 A062729 A062730 * A062732 A062733 A062734
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Jul 11 2001
|
|
|
EXTENSIONS
| Zero removed and offset corrected by Omar E. Pol (info(AT)polprimos.com), Jul 17 2009
|
| |
|
|
