Looks like the extropian GIMPS team is a go. A generous benefactor has unveiled a mac farm.
Consequently, the latest Mersenne prime is also the largest known prime, and also, the discoverer knows from that prime the largest known perfect number (which is a number that equals the sum of its factors, such as 6 and 28) since (2^n-1)*(2^(n-1)) is a perfect number if 2^n-1 is prime. Example, n=5, 2^n-1=31, 31*16=496 which is the sum of its factors.
As a side benefit, the LL algorithm provides a free system diagnostic, since a bit error will show up as a wacky intermediate result. One of my confusers, I mean computers, started getting bit errors a week before the power supply failed. The GIMPS algorithm will also show up a defective processor, or an overclocked counterfeit processor, etc.
Any other takers? spike