|
Search: id:A082050
|
|
|
| A082050 |
|
Sum of divisors of n that are not of the form 3k+1. |
|
+0
2
|
|
| 0, 2, 3, 2, 5, 11, 0, 10, 12, 7, 11, 23, 0, 16, 23, 10, 17, 38, 0, 27, 24, 13, 23, 55, 5, 28, 39, 16, 29, 61, 0, 42, 47, 19, 40, 86, 0, 40, 42, 35, 41, 88, 0, 57, 77, 25, 47, 103, 0, 57, 71, 28, 53, 119, 16, 80, 60, 31, 59, 153, 0, 64, 96, 42, 70, 121, 0, 87, 95, 56, 71, 190
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
a(A004611(n))=0.
|
|
FORMULA
|
G.f.: Sum(x^(2*k)*(2+3*x^k+x^(3*k))/(1-x^(3*k))^2,k=1..infinity). - Vladeta Jovovic (vladeta(AT)Eunet.yu), Apr 11 2006
|
|
PROGRAM
|
(PARI) for(n=1, 100, print1(sumdiv(n, d, if(d%3!=1, d))", "))
|
|
CROSSREFS
|
Cf. A000203, A046913, A078181, A078182, A082051, A027748.
Sequence in context: A079535 A050159 A059098 this_sequence A010242 A086507 A133568
Adjacent sequences: A082047 A082048 A082049 this_sequence A082051 A082052 A082053
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
Ralf Stephan (ralf(AT)ark.in-berlin.de), Apr 02 2003
|
|
|
Search completed in 0.002 seconds
|
