|
Search: id:A067710
|
|
|
| A067710 |
|
n! sum{k|n} (sum{j=1 to k} 1/j); the k-sum is over the positive divisors, k, of n. |
|
+0
1
|
|
| 1, 5, 17, 110, 394, 4884, 18108, 294384, 2054736, 27986400, 160460640, 5733590400, 26029779840, 727452230400, 11030096851200, 223495556659200, 1579093018675200, 83918534992588800, 553210247226470400
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
FORMULA
|
E.g.f.: Sum_{k>0} ln(1-x^k)/(x^k-1). - Vladeta Jovovic (vladeta(AT)Eunet.yu), Aug 01 2004
|
|
EXAMPLE
|
a(6) = 6! *(1 +(1 +1/2) +(1 +1/2 +1/3) +(1 +1/2 +1/3 +1/4 +1/5 +1/6)) because 1, 2, 3, and 6 are the divisors of 6.
|
|
CROSSREFS
|
Adjacent sequences: A067707 A067708 A067709 this_sequence A067711 A067712 A067713
Sequence in context: A096178 A084167 A062586 this_sequence A009240 A012174 A012259
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Leroy Quet (qq-quet(AT)mindspring.com), Feb 05 2002
|
|
|
Search completed in 0.002 seconds
|
