|
| |
|
|
A055031
|
|
Numerator of (Sum(m^(n-1),m=1..n-1)+1)/n.
|
|
6
|
|
|
|
1, 1, 2, 37, 71, 2213, 9596, 1200305, 24684613, 287152493, 1355849266, 427675990237, 1032458258547, 228796942438201, 16841089312342856, 665478473553144001, 1653031004194447737, 631449646252135295657, 3167496749732497119310
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,3
|
|
|
REFERENCES
|
R. K. Guy, Unsolved Problems Number Theory, A17.
|
|
|
LINKS
|
|
|
|
MATHEMATICA
|
Table[Numerator[(Sum[m^(n - 1), {m, n - 1}] + 1)/n], {n, 50}] (* Indranil Ghosh, May 17 2017 *)
|
|
|
PROG
|
(PARI) a(n) = numerator((sum(m=1, n - 1, m^(n - 1)) + 1)/n); \\ Indranil Ghosh, May 17 2017
(Python)
from sympy import Integer
def a(n): return ((sum(m**(n - 1) for m in range(1, n)) + 1)/Integer(n)).numerator() # Indranil Ghosh, May 17 2017
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn,frac
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
