lownash # 39561911 3400000 .. 3500000 - no primes

highnash # 39547695 2221000 .. 2300000 - no primes

highnash # 39547695 3400000 .. 3500000 - no primes

highnash # 39547695 3500000 .. 3800000 - sieving/llr

highnash # 39547695 3800000 .. 4000000 - sieving