|
| |
|
|
A017712
|
|
Denominator of sum of -24 th powers of divisors of n.
|
|
72
|
|
|
|
1, 16777216, 282429536481, 281474976710656, 59604644775390625, 2369190669160808448, 191581231380566414401, 4722366482869645213696, 79766443076872509863361, 500000000000000000000000, 9849732675807611094711841
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,2
|
|
|
COMMENTS
|
Sum_{d|n} 1/d^k is equal to sigma_k(n)/n^k. So sequences A017665-A017712 also give the numerators and denominators of sigma_k(n)/n^k for k = 1..24. The power sums sigma_k(n) are in sequences A000203 (k=1), A001157-A001160 (k=2,3,4,5), A013954-A013972 for k = 6,7,...,24. - comment from Ahmed Fares (ahmedfares(AT)my-deja.com), Apr 05 2001.
|
|
|
LINKS
|
Table of n, a(n) for n=1..11.
|
|
|
CROSSREFS
|
Cf. A017711.
Sequence in context: A017624 A016812 A016908 * A010812 A016968 A017040
Adjacent sequences: A017709 A017710 A017711 * A017713 A017714 A017715
|
|
|
KEYWORD
|
nonn,frac
|
|
|
AUTHOR
|
N. J. A. Sloane.
|
|
|
STATUS
|
approved
|
| |
|
|
