The On-Line Encyclopedia of Integer Sequences (OEIS)

A110027 revision #2

A110027

Smallest prime starting (through <*2+1> or <*2-1>) a complete four iterations Cunningham chain of the first or second kind, and not coming themselves from such an iteration.

2, 1531, 6841, 15391, 44371, 53639, 53849, 57991, 61409, 66749, 83431, 105871, 143609, 145021, 150151, 167729

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OFFSET

1,1

COMMENTS

The word "complete" indicates each chain is exactly 5 primes long (i.e. the chain cannot be a subchain of another one).

LINKS

Table of n, a(n) for n=1..16.

Chris Caldwell's Prime Glossary, Cunningham chains.

EXAMPLE

2 is here because, through <2p+1>, 2 -> 5 -> 11 -> 23 -> 47 and the chain ends here (with this operator).

1531 is here because, through <2p-1>, 1531 -> 3061 -> 6121 -> 12241 -> 24481 and the chain ends here (with this operator).

MAPLE

Terms computed by Gilles Sadowski

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: A233906 A329775 A226699 * * A179866 A296362

Adjacent sequences: A110024 A110025 A110026 * A110028 A110029 A110030

KEYWORD

easy,nonn,uned,new

AUTHOR

Alexandre Wajnberg (alexandre.wajnberg(AT)ulb.ac.be), Sep 03 2005

STATUS

approved