How is this going Nuri, it looks like your close to the end of B1=300K with B2=20xB1. It also looks like you decided to increase B1 to 400K?

Not suggesting you do it but...

7509426046902223253 | 67607*2^9851931+1
via p+1
7509426046902223254 = 2 x 3 ^ 2 x 829 x 8539 x 195967 x 300739