1,1

The next term (17866..79237) has 186 digits.

Table of n, a(n) for n=1..5.

(PARI) fu(n) = p=1; for(x=1, n, p*=twinu(x); if(isprime(p+2), print1(p+2", "))) \The n-th upper twin prime twinu(n) = { local(c, x); c=0; x=1; while(c<n, if(isprime(prime(x)+2), c++); x++; ); return(prime(x)) }

Cf. A097490, A097491, A097492.

Sequence in context: A093168 A330388 A276231 * A341377 A082687 A117731

Adjacent sequences: A097490 A097491 A097492 * A097494 A097495 A097496

nonn

Cino Hilliard, Aug 24 2004

Edited by Don Reble, Apr 16 2007

approved