1,1

Table of n, a(n) for n=1..10.

12*3^2-1=107, 107 and 109 twin primes so k(1)=12

18*107^2-1=206081, 206081 and 206083 twin primes so k(2)=18

Cf. A112879.

Sequence in context: A238922 A212128 A110932 * A211083 A100541 A337424

Adjacent sequences: A112877 A112878 A112879 * A112881 A112882 A112883

hard,nonn

Pierre CAMI, Oct 01 2005

Removed misleading mention of a(n) in NAME. - R. J. Mathar, Jun 20 2021

approved