

A110059


Smallest prime ending a complete Cunningham chain of the second kind (2x1) of length n.


4



11, 13, 5, 17041, 24481, 12338881, 1065601, 1985902081, 219416417281, 105230562877441, 1422461638625281, 444124661486837761, 3105111850422067201
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OFFSET

1,1


COMMENTS

"Complete" means that the chain is not part of a longer chain.
A005603 has the first prime of each chain.


LINKS

Table of n, a(n) for n=1..13.
Chris Caldwell's Prime Glossary, Cunningham chains.


EXAMPLE

a(4)=17041 because 2131,4261,8521,17041 are prime, but the preceding and following numbers (1066,34081) are not.


CROSSREFS

Cf. A005382, A005384, A057326, A059761, A005603.
Sequence in context: A034080 A107805 A177378 * A004476 A347522 A112133
Adjacent sequences: A110056 A110057 A110058 * A110060 A110061 A110062


KEYWORD

nonn


AUTHOR

Alexandre Wajnberg, Sep 04 2005


EXTENSIONS

Some terms computed by Gilles Sadowski.
Edited by Don Reble, May 16 2006


STATUS

approved



