OFFSET
1,1
COMMENTS
All terms are prime. - Alexander Adamchuk, Apr 27 2008
LINKS
Henri & Renaud Lifchitz, PRP Records.
MATHEMATICA
Select[Range[200], PrimeQ[8^# - 7^#] &] (* Vladimir Joseph Stephan Orlovsky, Feb 22 2012 *)
PROG
(PARI) is(n)=ispseudoprime(8^n-7^n) \\ Charles R Greathouse IV, Sep 04 2013
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Mike Oakes, May 18 2001, May 19 2001
EXTENSIONS
Two more terms 44029 and 76213 found by Ananda Tallur & Jean-Louis Charton in 2003.
Three more terms 83663, 173687 and 336419 found by Jean-Louis Charton in 2004 and 2008
New term 615997 found by Jean-Louis Charton corresponding to a probable prime with 556301 digits. Jean-Louis Charton, Sep 02 2009
STATUS
approved