A112880 The factors k(n) such that the twin-prime subsequence A112879 is obtained.

12, 18, 492, 702, 2310, 2370, 130650, 980910, 5528418, 21357012

Offset: 1

Author

Pierre CAMI, Oct 01 2005

Keywords

• hard
• nonn

Examples

			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
		

Crossrefs

Cf. A112879.

Extensions

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