Thrown a bunch of pretty powerful machines at it but nothing yet, I guess the starting difficulty is quite high.
That doesn't really matter. It's the prime if it's like 10^24987236823572852 well we would be fucked
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43 and so on goes the list and you get some crazy high numbers then it's high, my primespersec reduced x10 by now