A139074 or 0 if no such prime exists.

[Artur]

Dear Neil,
Proof that such prime in A139074 doesn't exist will be as difficult as 
proof that set of Fermat Primes is complete, and surely we don't see 
these proof for our life. Mayby will be better to say  0 if we don't 
know yet such prime.
Best wishes
Artur




While I am not as pessimistic as Artur on the Fermat primes question (or 
maybe I just hope for a long life :)), I agree that this is a better 
definition.

Drew

On Apr 22 2008, Artur wrote:

>Dear Neil,
>Proof that such prime in A139074 doesn't exist will be as difficult as 
>proof that set of Fermat Primes is complete, and surely we don't see 
>these proof for our life. Mayby will be better to say  0 if we don't 
>know yet such prime.
>Best wishes
>Artur
>