See the first post of the 14th drive. There are only 2 more known primes after this one for k=600-1001 n=1.5M-2M. So you found a rarity.
The 13th drive has only one more known prime for k=400-600 n=1.5M-2M.
So not much hit-and-miss. :-)
Last fiddled with by gd_barnes on 2018-02-11 at 05:39
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