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Old 2017-03-16, 23:50   #7
carpetpool
 
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"Sam"
Nov 2016

23·41 Posts
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Thanks, CRGreathouse for those terms. To make sure (so an OEIS sequence can be added), are these the correct indices n (for a(n)) in order up to n = 20k?

I will try to add in an OEIS sequence if so.

Also just for curiosity, what is the density for the prime indices n such that a(n) is prime for compared to the primes n such that 2^n-1 (Mersenne) is prime for?

In other words, for any prime n, what is the (approximate) probability that a(n) is prime for, and for any given prime n, is there a greater chance that a(n) or 2^n-1 is prime for?

Last fiddled with by carpetpool on 2017-03-16 at 23:56
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