|
|
A144046
|
|
Numbers n such that |n!-107| and |n!+107| are prime.
|
|
6
|
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
FORMULA
|
5!-107=13 and 5!+107=227, so 5 is a member.
|
|
MATHEMATICA
|
lst={}; a=107; Do[If[PrimeQ[n!-a]&&PrimeQ[n!+a], AppendTo[lst, n]], {n, 0, 20^2}]; lst
|
|
PROG
|
(PARI) for(n=1, 106, if(ispseudoprime(abs(n!-107))&&ispseudoprime(n!+107), print1(n", "))) \\ Charles R Greathouse IV, Oct 05 2011
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,fini,full
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|