A110024 Smallest primes starting a complete three iterations Cunningham chain of the second kind.

2131, 2311, 6211, 7411, 10321, 18121, 22531, 23011, 24391, 29671, 31771, 35311, 41491, 46411, 54601, 56311, 60331, 61381, 67651, 78031, 85381, 96931, 99871, 109471, 126001, 134731, 156691, 162451, 165331, 170851, 185131, 205171, 224401

Offset

1,1

Comments

The word "complete" indicates each chain is exactly 4 primes long (i.e., the chain cannot be a subchain of another one). Other sequences give also primes included in longer chains ("starting" them or not).

Terms computed by Gilles Sadowski.

Links

Table of n, a(n) for n=1..33.

Chris Caldwell's Prime Glossary, Cunningham chains.

Example

2311 is here because, through the operator <*2-1> of the chains of the second kind,
2311 -> 4621 -> 9241 -> 18481 and the chain ends here (with this operator).

Crossrefs

Cf. A023272, A023302, A023330, A005384, A005385, A059452, A059455, A007700

Cf. A059759, A059760, A059761, A059762, A059763, A059764, A059765, A038397, A104349, A091314, A069362, A016093, A014937, A057326.

Sequence in context: A338070 A210271 A066817 * A260068 A237070 A157768

Adjacent sequences: A110021 A110022 A110023 * A110025 A110026 A110027

Keyword

easy,nonn

Author

Alexandre Wajnberg, Sep 03 2005

Extensions

Edited and extended by R. J. Mathar, May 08 2009

Status

approved