|
|
A334604
|
|
Denominator of Sum_{k=1..n} (-1)^(k+1)/k^5.
|
|
3
|
|
|
1, 32, 7776, 248832, 777600000, 777600000, 13069123200000, 418211942400000, 101625502003200000, 101625502003200000, 16366888723117363200000, 16366888723117363200000, 6076911214672415134617600000
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
The first few fractions are 1, 31/32, 7565/7776, 241837/248832, 755989457/777600000, 755889457/777600000, ... = A136676/A334604.
|
|
MATHEMATICA
|
Denominator @ Accumulate[Table[(-1)^(k + 1)/k^5, {k, 1, 13}]] (* Amiram Eldar, May 08 2020 *)
|
|
PROG
|
(PARI) a(n) = denominator(sum(k=1, n, (-1)^(k+1)/k^5)); \\ Michel Marcus, May 07 2020
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|