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!)
A232620 Numbers n such that (2n)!! mod (2n-1)!! is greater than (2n+2)!! mod (2n+1)!!. 1
4, 615, 9090, 11011 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Numbers n such that A232618(n) > A232618(n+1).
a(5) > 10 * 2^20.
LINKS
EXAMPLE
4 is in the sequence because A232618(4) > A232618(5).
PROG
(Python)
o=e=1 # odd, even
prev=0
for n in range(1, 1000000000, 2):
o*=n
e*=n+1
cur = e%o
if prev>cur: print str(n//2)+', ',
prev=cur
if (n&8191)==8191: print '.',
CROSSREFS
Sequence in context: A069641 A215920 A210853 * A219892 A079103 A191953
KEYWORD
nonn,hard,more
AUTHOR
Alex Ratushnyak, Nov 27 2013
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 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)