OFFSET
1,2
COMMENTS
All primes certified using PFGW from Primeform group.
EXAMPLE
(2^2-1)*(2^2-1+1)-1=11 prime 2^2-1=M(1) so a(1)=1
(2^3-1)*(2^3-1+1)-1=55 composite
(2^3-1)*(2^3-1+3)-1=69 composite
(2^3-1)*(2^3-1+5)-1=83 prime 2^3-1=M(2) so a(2)=5
CROSSREFS
KEYWORD
dead
AUTHOR
Pierre CAMI, Aug 11 2008
EXTENSIONS
Missing terms 2357 and 599 inserted by Jens Kruse Andersen, Jul 30 2014
STATUS
approved