A110059 - OEIS

A110059

Smallest prime ending a complete Cunningham chain of the second kind (2x-1) of length n.

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

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

KEYWORD

nonn

AUTHOR

EXTENSIONS

Some terms computed by Gilles Sadowski.

Edited by Don Reble, May 16 2006

STATUS

approved