|
Search: id:A057625
|
|
|
| A057625 |
|
n! * sum 1/k! where the sum is over all positive integers k that divide n. |
|
+0
6
|
|
| 1, 3, 7, 37, 121, 1201, 5041, 62161, 423361, 5473441, 39916801, 818959681, 6227020801, 130784734081, 1536517382401, 32256486662401, 355687428096001, 10679532671808001, 121645100408832001, 3770998783116364801
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
Sets of lists of equal size, cf. A000262. - Vladeta Jovovic (vladeta(AT)eunet.rs), Nov 02 2003
|
|
LINKS
|
Leroy Quet, Home Page (listed in lieu of email address)
|
|
FORMULA
|
E.g.f.: Sum_{n>0}(exp(x^n)-1). - Vladeta Jovovic (vladeta(AT)eunet.rs), Dec 30 2001
E.g.f.: Sum_{k>0} x^k/k!/(1-x^k). - Vladeta Jovovic (vladeta(AT)eunet.rs), Oct 14 2003
|
|
EXAMPLE
|
a(4) = 4! (1 + 1/2! + 1/4!) = 24 (1 +1/2 + 1/24) = 37.
|
|
CROSSREFS
|
Cf. A061095, A038041, A038048, A005225.
Cf. A038041, A005225, A000005.
Sequence in context: A167169 A049493 A020463 this_sequence A087208 A161675 A086031
Adjacent sequences: A057622 A057623 A057624 this_sequence A057626 A057627 A057628
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Leroy Quet Oct 09 2000
|
|
|
Search completed in 0.002 seconds
|
