Statistics on Certain Large Primes
M. F. Jones, M. Lal, W. J. Blundon · Mathematics of Computation · 1967
Each available core location represents two odd numbers, differing by 75,000 and is initially set to a flagged record mark.If in the sieve, the lower number is found to be composite, the record mark is cleared, and if the higher number is so found, the flag is cleared.