4 ms·
Great time to raise something I've long wondered about: N[0] = 2 N[i] = 2^N[i-1] - 1 Does _that_ generate only primes?
by ctdonath 15y ago
Great time to raise something I've long wondered about:
N[0] = 2
N[i] = 2^N[i-1] - 1
Does _that_ generate only primes?
- deleted 15y ago[deleted]
- ctdonath 15y agoM(p) = 2^p - 1 M does not produce primes for most values of p. The subset I noted, for what few values we can generate, seems to. Just wondering if anyone had worked on that particular subset.
- tzs 15y agoThat's not yet known. It's not even known if that sequence contains infinitely many primes or not.