Quote:
Originally Posted by Glenio
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.
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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?
