C168_159978_10379 completed - 42 hours for 7.2M matrix (TD=140).
Code:
p81 factor: 176190458832307539045870221035101912307227945278708863829377022238051342624410069
p88 factor: 2152923878449155816448010285430050832795371722991249169479629383610785119695907474066819
https://pastebin.com/FdTJjSku