2048/contains 2048-bit primes.4096/contains 4096-bit primes.
These primes (both 2048 and 4096) were generated with
OpenSSL 1.0.1k-fips 8 Jan 2015 on a Fedora 21 container
running on a CoreOS virtual machine in AWS.
See the generate.sh script.
It uses the default 2 generator.