login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A117125
Positive integers that can be expressed as the difference between a factorial and a double factorial.
0
0, 1, 3, 4, 5, 9, 15, 16, 21, 22, 23, 72, 105, 112, 117, 118, 119, 336, 615, 672, 705, 712, 717, 718, 719, 1200, 4095, 4656, 4935, 4992, 5025, 5032, 5037, 5038, 5039
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
1,3
LINKS
Table of n, a(n) for n=1..35.
FORMULA
n! - m!! being n! > m!!
EXAMPLE
117 = 5! - 3!!
4992 = 7! - 6!!
CROSSREFS
Cf.
A110903
,
A111300
.
Sequence in context:
A356604
A050161
A195609
*
A000692
A195971
A080552
Adjacent sequences:
A117122
A117123
A117124
*
A117126
A117127
A117128
KEYWORD
nonn
AUTHOR
Paolo P. Lava
and
Giorgio Balzarotti
, Apr 20 2006
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 March 28 12:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)