24 Oct
2015
24 Oct
'15
12:20 p.m.
On Oct 24, 2015, at 12:55 PM, Henry Baker <hbaker1@pipeline.com> wrote:
Also, how rare are primes of the form 1+2*p_1*p_2*p_3..., where p_i are odd primes (i.e., primes to the 1st power only) ?