2,1

Table of n, a(n) for n=2..79.

a(2)=3 because 3+4 and 7+4 are primes.

Cf. A105439, A105444, A105445.

Sequence in context: A185053 A165655 A157576 * A065425 A096482 A139868

Adjacent sequences: A105440 A105441 A105442 * A105444 A105445 A105446

nonn

Cino Hilliard, May 02 2005

Edited by Don Reble, Jun 11 2007

approved