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Search: id:A079140
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| A079140 |
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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
1
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OFFSET
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1,2
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COMMENT
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Some of the larger entries may only correspond to probable primes.
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EXAMPLE
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a(2)=2 because the product of the first two terms of A014574 - 1, 4*6-1 = 23, is prime.
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PROGRAM
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(PARI) {atm(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: A122823 A063289 A049635 this_sequence A166005 A155009 A045371
Adjacent sequences: A079137 A079138 A079139 this_sequence A079141 A079142 A079143
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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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