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Search: id:A079139
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| A079139 |
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Numbers n such that (Product of first n twin prime pair averages [A014574] ) + 1 is prime. |
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+0
2
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OFFSET
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1,2
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COMMENT
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a(3) and a(4) certified prime with Primo.
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EXAMPLE
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a(2)=5 because the product of the first five terms of A014574 + 1, 4*6*12*18*30+1 = 155521, is prime.
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PROGRAM
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(PARI) { atp(N)= local(t, c); t=1; c=0; forprime(p=2, N, if(isprime(p+2), t*=p+1; c++; if(isprime(t+1), print1(c" ")))) }
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CROSSREFS
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Cf. A014574.
Sequence in context: A096763 A003185 A027801 this_sequence A081070 A043025 A125836
Adjacent sequences: A079136 A079137 A079138 this_sequence A079140 A079141 A079142
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KEYWORD
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more,nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Dec 26 2002
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