login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A004787 Numbers k such that 7!*(2k-8)!/(k!*(k-1)!) is an integer. 0
4, 7, 8, 991, 2481, 3479, 5645, 6163, 6581, 8178, 8179, 8242, 9272, 10288, 12195, 13067, 13976, 15199, 15813, 16172, 18329, 18371, 18686, 18723, 18747, 19294, 19438, 22198, 23531, 23717, 26198, 26315, 26678, 27877, 28429, 30553, 30593, 30689, 31327 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Select[Range[10^4], IntegerQ[7! (2 # - 8)!/(#! (# - 1)!)] &] (* Arkadiusz Wesolowski, Sep 06 2011 *)
CROSSREFS
Sequence in context: A093105 A141669 A190967 * A210617 A191762 A107905
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from David W. Wilson, Dec 11 1999
Offset corrected and 2 initial terms added by Arkadiusz Wesolowski, Sep 06 2011
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 26 22:44 EST 2024. Contains 370354 sequences. (Running on oeis4.)