((2^3)^3)^3 = 2^127 not 2^9

It is because the fibonnaci sequence doesn't contain 2 that this works.
((((2^7)^7)^7)^7)^7)^7 -1
= (((2^49)^1.6e150)^)^7)^7 -1
= ((2^1.6e150)^3.1461e1051)^7)^7 -1
= (2^3.1461e1051)^3.1e7360)^7 -1
= too big for my calc

every number in this chain is prime, the highest is 3.1e7369 (that's 7369 0s)



== approx 2^