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Old 2020-11-19, 13:24   #39
rogue
 
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"Mark"
Apr 2003
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Actually there are 78 primes for 19000 <= x < 20000. I miscounted above.

All x < 20000 has now been double-checked. No missing primes/PRPs.

My tactic for testing 20000 <= x < 30000 is a little different due to speed of sieving. I am testing all x in that range at once, but subdividing by y as PRP tests for smaller y are faster. I am testing for y <= 1000 while sieving for y > 1000 continues.
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