primes of the form (a-1)*(a^(p*q)-1)/(a^p-1)/(a^q-1)
- Is there a name for and/or have primes of the form
Here p and q are primes and a is any positive integer. Many of these
numbers are prime. Especially nice is the case a = 2 when we have
Note that (x-1)*(x^(p*q)-1)/(x^p-1)/(x^q-1) is the pq-th cyclotomic
polynomial. In particular, it is a polynomial with integer coefficients.
Except for the case where p or q is 2, these primes don't appear to be in