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2020-08-05, 12:20   #2
kriesel

"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest

23·571 Posts

Quote:
 Originally Posted by alfamath1004 Hi, could anyone please tell me which of the following assignments give the possibility to win the $3,000 prize? or the$50,000 prize? LL - LL first test LL-WR- LL test for world record LL-100M- LL test 100+ million digits ... PRP - PRP first test PRP-WR- PRP test for world record PRP-100M- PRP test 100+ million digits ... I know the question has been already asked many times, but I didn't find a precise answer. Thank you
$3K possible but unlikely for PRP, PRP-WR, LL, LL-WR.$50K possible but very unlikely for PRP-100M. LL-100M also but not recommended because of the likelihood of an error i n the long computation. https://www.mersenne.org/legal/
The most likely outcome is losing money if accounting for the cost of electricity to run the computations and prorated cost of hardware to run it on. It's much worse economically (before taxes) than buying lottery tickets. I compute the cost of a 100Mdigit primality test as $35 for a well chosen gpu and software and electricity at$0.12/kwhr, and the chance of it finding a prime less than 1 in 6 million, so the probability weighted payback on that $35. spent is$0.0083, so a return of 0.036% . Lotteries typically return 60.-70.%, nearly 1800 TIMES better payback, and still a losing proposition. Do GIMPS runs for fun, not profit.

Last fiddled with by kriesel on 2020-08-05 at 12:21