|
| |
|
|
A092970
|
|
Smallest prime of the form n!/k + 1. k < = n, or 0 if no such prime exists.
|
|
2
| |
|
|
2, 2, 3, 7, 31, 181, 1009, 13441, 45361, 453601, 3991681, 39916801, 566092801, 10897286401, 130767436801, 2988969984001, 25406244864001, 0, 8109673360588801, 304112751022080001, 2688996956405760001
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
EXAMPLE
| a(10) = 453601 = 10!/8 + 1, as 10!/10 + 1 and 10!/9 + 1 are both composite.
|
|
|
PROG
| (PARI) a(n)=for (i=1, n, if(isprime(n!/(n-i+1)+1), return((n!/(n-i+1)+1))))
|
|
|
CROSSREFS
| Cf. A092968, A092969, A092068.
Sequence in context: A077001 A180996 A087522 * A052449 A053413 A143673
Adjacent sequences: A092967 A092968 A092969 * A092971 A092972 A092973
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 26 2004
|
|
|
EXTENSIONS
| Corrected and extended by Mohammed Bouayoun (bouyao(AT)wanadoo.fr), Mar 26 2004
|
| |
|
|
