OFFSET
1,1
COMMENTS
Carlos Rivera's Problem 50 is devoted to this topic. If we pair differences according to magnitude, we first obtain 177-140=37 a prime. This raises the question as to whether there are other such prime values.
LINKS
Carlos Rivera, Problem 50. Is there a Cullen prime Cn with n prime?, The Prime Puzzles and Problems Connection.
FORMULA
EXAMPLE
a(1)=140 because the first pair of n are 1 and 141. 141 - 1 = 140.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Enoch Haga, Feb 18 2007
EXTENSIONS
Offset 1 from Michel Marcus, Sep 27 2020
a(14)-a(15) added by Florian Baur, Sep 27 2020
STATUS
approved