

A079140


Numbers n such that (Product of first n twin prime pair averages [A014574] )  1 is prime.


0




OFFSET

1,2


COMMENTS

Some of the larger entries may only correspond to probable primes.


LINKS

Table of n, a(n) for n=1..7.


EXAMPLE

a(2)=2 because the product of the first two terms of A014574  1, 4*61 = 23, is prime.


PROG

(PARI) {atm(N)=local(t, c); t=1; c=0; forprime(p=2, N, if(isprime(p+2), t*=p+1; c++; if(isprime(t1), print1(c" "))))


CROSSREFS

Cf. A014574.
Sequence in context: A190518 A190750 A049635 * A176897 A166005 A243009
Adjacent sequences: A079137 A079138 A079139 * A079141 A079142 A079143


KEYWORD

more,nonn


AUTHOR

Jason Earls, Dec 26 2002


STATUS

approved



