|
| |
|
|
A112863
|
|
Numbers n such that (2*n)!/(2*(n!)^2)+1 is prime.
|
|
5
| |
|
|
1, 3, 5, 6, 14, 19, 24, 45, 49, 62, 72, 122, 149, 197, 209, 222, 349, 409, 491, 527, 601, 675, 728, 769, 795, 853, 1039, 1318, 1599, 2069, 2279, 2567, 2634, 3286, 3482, 6880, 6919, 9117, 9276, 9564, 10898, 13061, 14570
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
CROSSREFS
| Cf. A001700(n-1)=(2*n)!/(2*(n!)^2), A112864 primes of the form (2*n)!/(2*(n!)^2)+1, A112853 (2*n)!/n!-1 is prime, A112855 (2*n)!/n!+1 is prime, A066726 (2*n)!/(n!)^2-1 is prime, A112859 (2*n)!/(n!)^2+1 is prime, A112861 (2*n)!/(2*(n!)^2)-1 is prime.
Sequence in context: A048968 A185737 A092862 * A180694 A030052 A099678
Adjacent sequences: A112860 A112861 A112862 * A112864 A112865 A112866
|
|
|
KEYWORD
| hard,nonn
|
|
|
AUTHOR
| Hugo Pfoertner (hugo(AT)pfoertner.org), Sep 30 2005
|
|
|
EXTENSIONS
| More terms from Charles R Greathouse IV, Sep 26 2006
|
| |
|
|
