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Search: id:A151894
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| A151894 |
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Numbers n such that n! + second prime after n! is prime. |
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+0
4
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| 2, 3, 5, 6, 7, 8, 11, 17, 42, 66, 76, 93, 139, 157
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OFFSET
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1,1
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COMMENT
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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!
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MATHEMATICA
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a = {}; Do[If[PrimeQ[n! + NextPrime[n!, 2]], AppendTo[a, n]], {n, 1, 200]; a (*Artur Jasinski*)
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CROSSREFS
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Cf. A002981, A151892, A151893, A151903.
Sequence in context: A063752 A016741 A006431 this_sequence A028229 A104452 A062877
Adjacent sequences: A151891 A151892 A151893 this_sequence A151895 A151896 A151897
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Apr 12 2008
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