How long will it take this program to search for all 70digit factors? Or, most of them? How about 1% of the 70digit range?
ECM on this number has ruled out factors smaller than about 67 digits, and a 70digit or smaller factor is unlikely. So, I'm not even sure you should set it to look at 70 digits maybe 73 is smarter. How many k's are there that make 73digit candidate factors?
