|
| |
|
|
A063744
|
|
a(n) = sigma(a(n-1) * number of divisors of a(n-1), a(1)=2.
|
|
1
| |
|
|
2, 6, 48, 1240, 46080, 10537956, 4755179520, 21601740363840, 320026934857728000, 5141450783421628416000, 254900463912224253775282176, 22582740409889438693597632266240
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,40
|
|
|
PROG
| (PARI) s(n) = if(n<2, n=2, sigma(s(n-1))*numdiv(s(n-1))); for(n=1, 20, print(s(n)))
(PARI) { for (n=1, 40, if (n>1, a=sigma(a)*numdiv(a), a=2); write("b063744.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 29 2009]
|
|
|
CROSSREFS
| Sequence in context: A129464 A003053 A113296 * A141609 A096313 A126023
Adjacent sequences: A063741 A063742 A063743 * A063745 A063746 A063747
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Aug 14 2001
|
| |
|
|
