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Search: id:A096177
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| A096177 |
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Primes p such that primorial(p)/2+2 is prime. |
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+0
4
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| 3, 5, 7, 13, 29, 31, 37, 47, 59, 109, 223, 307, 389, 457, 1117, 1151, 2273, 9137, 10753, 15727, 25219, 26459, 29251, 30259
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Discussion group for the primality-testing program PrimeForm.
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EXAMPLE
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a(3)=7 because primorial(7)/2+2=A070826(4)+2=2*3*5*7/2+2=107 is prime.
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MATHEMATICA
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k = 1; Do[If[PrimeQ[n], k = k*n; If[PrimeQ[k/2 + 2], Print[n]]], {n, 2, 100000}] (Propper)
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CROSSREFS
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Cf. A070826, A096178 primes of the form primorial(p)/2+2, A096547 primes p such that primorial(p)/2-2 is prime, A067024 smallest p+2 that has n distinct prime factors, A014545 primorial primes, A087398.
Sequence in context: A007658 A024724 A024946 this_sequence A128547 A087383 A038928
Adjacent sequences: A096174 A096175 A096176 this_sequence A096178 A096179 A096180
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KEYWORD
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more,nonn
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AUTHOR
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Hugo Pfoertner (hugo(AT)pfoertner.org), Jun 27 2004
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EXTENSIONS
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7 additional terms, corresponding to pseudoprimes, from Ryan Propper (rpropper(AT)stanford.edu), Jul 03 2005
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