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A110059 Smallest prime ending a complete Cunningham chain of the second kind (2x-1) 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
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
Sequence in context: A034080 A107805 A177378 * A004476 A347522 A112133
KEYWORD
nonn
AUTHOR
Alexandre Wajnberg, Sep 04 2005
EXTENSIONS
Some terms computed by Gilles Sadowski.
Edited by Don Reble, May 16 2006
STATUS
approved

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Last modified February 21 06:16 EST 2024. Contains 370219 sequences. (Running on oeis4.)