20200805, 10:53  #1 
Aug 2020
1_{2} Posts 
What assignments to win money???
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 LLWR LL test for world record LL100M LL test 100+ milion digits D  LL doublecheck PRP  PRP first test PRPWR PRP test for world record PRP100M PRP test 100+ milion digits PRPD  PRP doublecheck TF  trial factoring TFLMH  trial factoring LMH PM1L  factor P1 large PRPCF  PRP cofactor test PRPCFD  PRP cofactor doublecheck ECM  factor ECM small ECMCF  ECM cofactor ECMF  factor ECM Fermat I know the question has been already asked many times, but I didn't find a precise answer. Thank you 
20200805, 12:20  #2  
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
4451_{10} Posts 
Quote:
$50K possible but very unlikely for PRP100M. LL100M 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 20200805 at 12:21 

20200805, 13:52  #3 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
8,627 Posts 
As the above post hinted at, we are transitioning to doing PRP as the primary test to to find primes (it used to be the LL test). So, all first time checks should be PRP tests. The PRP test has 2 main advantages. 1 is superior error checking during the test to catch errors during a test. This prevents a whole test from becoming wasted by an error. The second is a new technique that currently being worked on and will soon be deployed that will allow us to eliminate a full double check of every test. Instead once it is deployed, the PRP test will generate a file, that can be processed to verify the result and accuracy of the test in a small fraction of the time.
Currently all first time tests being assigned are higher than the previous record, and would be eligible for the $3K prize. So the "world record" assignments are currently the same as the "first test" assignments. 
20200805, 14:00  #4 
Undefined
"The unspeakable one"
Jun 2006
My evil lair
2^{2}×5×7×41 Posts 
I think the salient point here to answer the question is that for the most part no assignments win money unless you are very very lucky to find the needle in the haystack.

20200805, 14:04  #5 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
8,627 Posts 

20200805, 14:28  #6 
Undefined
"The unspeakable one"
Jun 2006
My evil lair
2^{2}×5×7×41 Posts 
I should add that no one knows if there are any more needles to be found. There might not be any more.

20200805, 15:07  #7 
Sep 2017
USA
2^{4}×3^{2} Posts 

20200805, 15:10  #8 
Undefined
"The unspeakable one"
Jun 2006
My evil lair
2^{2}·5·7·41 Posts 

20200805, 18:13  #9 
Einyen
Dec 2003
Denmark
2^{2}×3×5×7^{2} Posts 
It's like the lottery commercial in The Simpsons, you have to listen to the quiet part or read the small print:
"The state lottery where everybody wins. Actual odds of winning 1 in 380 million". 
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