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A144046
Numbers n such that |n!-107| and |n!+107| are prime.
6
3, 4, 5, 6, 7, 8, 80
OFFSET
1,1
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
Sequence in context: A037349 A037350 A014615 * A210934 A354774 A194276
KEYWORD
nonn,fini,full
AUTHOR
STATUS
approved