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

1,1

Links

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

Example

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.

Sequence in context: A238922 A212128 A110932 * A211083 A100541 A337424

Adjacent sequences: A112877 A112878 A112879 * A112881 A112882 A112883

Keyword

hard,nonn

Author

Pierre CAMI, Oct 01 2005

Extensions

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

Status

approved