OFFSET
1,1
COMMENTS
The next term is > 400000.
Equals A063791 + 1. - Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008
Some of the results were computed using the PrimeFormGW (PFGW) primality-testing program. - Hugo Pfoertner, Nov 14 2019
EXAMPLE
a(1) = 4 because 2^4 - 4 - 1 = 11 is prime.
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Hugo Pfoertner, Oct 18 2004
EXTENSIONS
a(15) (a PRP) from Karsten Bonath, Jun 07 2018
STATUS
approved