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A232620
Numbers n such that (2n)!! mod (2n-1)!! is greater than (2n+2)!! mod (2n+1)!!.
1
4, 615, 9090, 11011
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OFFSET
1,1
COMMENTS
Numbers n such that
A232618
(n) >
A232618
(n+1).
a(5) > 10 * 2^20.
LINKS
Table of n, a(n) for n=1..4.
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
Cf.
A006882
,
A232618
.
Sequence in context:
A069641
A215920
A210853
*
A219892
A079103
A191953
Adjacent sequences:
A232617
A232618
A232619
*
A232621
A232622
A232623
KEYWORD
nonn
,
hard
,
more
AUTHOR
Alex Ratushnyak
, Nov 27 2013
STATUS
approved
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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)