

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
(list;
graph;
refs;
listen;
history;
text;
internal format)



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



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS

Some terms computed by Gilles Sadowski.


STATUS

approved



