OFFSET
1,10
COMMENTS
All primes certified.
For M(26), a(26)=4166, b(26)=1, c(26)=1.
For M(27), a(27)=5880, b(27)=-1, c(27)=-1.
For M(28), a(28)=3997, b(28)=-1, c(28)=-1; with the following expression being a certified prime ((3997*(2^86243-1))^3)*((3997*(2^86243-1))^3-1)-1.
EXAMPLE
((1*(2^2-1))^3)*((1*(2^2-1))^3-1)-1=701 prime 2^2-1=M(1) a(1)=1 b(1)=-1 c(1)=-1
((1*(2^3-1))^3)*((1*(2^3-1))^3+1)-1=117991 prime 2^3-1=M(2) a(2)=1 b(2)=1 c(2)=-1
((1*(2^5-1))^3)*((1*(2^5-1))^3-1)-1=887473889 prime 2^5-1=M(3) a(3)=1 b(3)=-1 c(3)=-1
CROSSREFS
KEYWORD
sign,tabf
AUTHOR
Pierre CAMI, Mar 24 2009
STATUS
approved