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A151892
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Numbers n such that n! + next prime after n! is prime.
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3
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1, 2, 3, 4, 6, 7, 14, 15, 20, 25, 32, 34, 35, 67, 89, 191, 316, 411
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Because numebrs of the form: (n! + prime) are divisable by all primes <= n that mean that first prime number can have form n! + next prime after n! and no primes of the form n! + k for k > 1 and k < next prime after n!
Next term exceeds 600. [From Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 11 2010]
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MATHEMATICA
| a = {}; Do[If[PrimeQ[n! + NextPrime[n! ]], AppendTo[a, n]], {n, 1, 200]; a (*Artur Jasinski*)
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CROSSREFS
| Cf. A002981, A151894, A151893, A151903.
Sequence in context: A039947 A096477 A039059 * A162570 A073639 A130776
Adjacent sequences: A151889 A151890 A151891 * A151893 A151894 A151895
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KEYWORD
| nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Apr 12 2008
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EXTENSIONS
| a(17) & a(18) from Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 11 2010
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