1,3

Table of n, a(n) for n=1..15.

7*6*(2^5-1)-1=1301 prime, 1301 and 1303 twin primes so K(3)=7 as M(3)=2^5-1

Cf. A000043.

Sequence in context: A129662 A012482 A124985 * A196113 A286506 A286406

Adjacent sequences: A126609 A126610 A126611 * A126613 A126614 A126615

nonn

Pierre CAMI, Feb 08 2007

approved