login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A082689 Numerator of n*sum(k=1,(-1)^(k+1)/(n+k)). 1
1, 1, 13, 43, 347, 1013, 36331, 20431, 973993, 5386001, 15273079, 104604613, 1495109359, 1357580423, 113225690813, 2150797323119, 6214827398881, 1922198200679, 206285491870477, 64286037044903, 7668497434066577 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

FORMULA

limit n->infinity n*sum(k=1, (-1)^(k+1)/(n+k)) = 1/4

CROSSREFS

Cf. A082690 (denominators).

Sequence in context: A104115 A063650 A144236 * A123294 A015247 A033652

Adjacent sequences:  A082686 A082687 A082688 * A082690 A082691 A082692

KEYWORD

frac,nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 12 2003

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 15 18:22 EST 2012. Contains 205835 sequences.