View Single Post
Old 2020-05-23, 18:38   #13
paulunderwood
 
paulunderwood's Avatar
 
Sep 2002
Database er0rr

2×1,723 Posts
Default

Quote:
Originally Posted by Glenio View Post
70237298350549551468899 รก is congruent with 1 (mod 4) and no cofactor is also known; therefore, there may still be a chance that 2 ^ 70237298350549551468899-1 is prime. This is just an example that I am taking into account.
Is it 3 mod 4?

How many tons of coal are needed to LL test it?

What do you calculate the "chance" of being prime is?

Let me give you an example prime p=2^82589933-1 definitely has no small factors. So is 2^p-1 prime? Anyone?


Last fiddled with by paulunderwood on 2020-05-23 at 18:47
paulunderwood is offline   Reply With Quote