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Search: id:A151892
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| A151892 |
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Numbers n such that n! + next prime after n! is prime. |
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+0
4
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| 1, 2, 3, 4, 6, 7, 14, 15, 20, 25, 32, 34, 35, 67, 89, 191
(list; graph; listen)
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OFFSET
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1,2
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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! ]], AppendTo[a, n]], {n, 1, 200]; a (*Artur Jasinski*)
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CROSSREFS
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Cf. A002981, A151894, A151893, A151903.
Sequence in context: A039947 A096477 A039059 this_sequence A162570 A073639 A130776
Adjacent sequences: A151889 A151890 A151891 this_sequence A151893 A151894 A151895
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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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