Quote:
Originally Posted by diep
3M  4M had roughly 53892 exponents to test
4M  5M has roughly 53990 exponents to test

From the latest sieve file for 3M4M I get a slightly different number: only 53812 exponents.
And (just for comparison) for the range 5M6M there are 53731 exponents.
As VBCurtis already mentioned: The difference is quite small and is just the typical fluctuation in the distribution of surviving exponents after sieving.