Thought you were trying to get an early start on the 200K point score ...

As for your choice of B1, ... others will have to comment, sieving will probably reach 2^50 by then, but your goal is to reduce it to <1000 ...

I'd just worry about P-1'ing very lightly and having to redo them again later, otherwise I'd say knock yourself out.

I was considering doing the same sort of thing...

Trying to eliminate the k/n's in the range of 13460000 to 13470000 for those tests reported dropped http://www.seventeenorbust.com/secret.

I wish Alien88 would remove those 9999999 tests and place those 33661 tests back where they should be.