Linear(0,1,1,-1,n)=L1(n)=L1(n-1)-2*L1(n-2)
= Lucas serie P=1,Q=2
L1(0)=0,L1(1)=1,L1(2)=1,L1(3)=-1 ...
For n>65 n becomes prime when Abs(L1(n)) is Prp.
Prp b=3,7

To be completed...