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Old 2021-09-21, 14:53   #980
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26*578^199886-1 found by [AF>Belgique] melektha (552073 digits)
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Old 2021-09-22, 21:07   #981
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Why many old CRUS primes are again on Top 5000 page?
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Old 2021-09-22, 22:19   #982
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Quote:
Originally Posted by pepi37 View Post
Why many old CRUS primes are again on Top 5000 page?
To clarify: They are only showing on the status page.

Reason: They were changed to an Anonymous person.

Last fiddled with by gd_barnes on 2021-09-22 at 22:24
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Old 2021-09-22, 23:33   #983
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Quote:
Originally Posted by gd_barnes View Post
To clarify: They are only showing on the status page.

Reason: They were changed to an Anonymous person.

Why?
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Old 2021-09-23, 06:51   #984
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Quote:
Originally Posted by dannyridel View Post
Why?
The people who found them did not wish to report them on the top-5000 site so Reb had reported them as a generic SRBase person. This turned out not to work because it accumulated a lot of primes for the SRBase person. We were informed by Prof. Caldwell at the top-5000 site that it was not fair to other individuals to have a "set" of anonymous individuals accumulated as one person for top-5000 prime scoring purposes.

The "anonymous" person does not compete with other individuals for top-5000 prime score. It is just ignored for person scoring purposes.

This is standard procedure for large projects who have many people who don't want to mess with reporting primes to the top-5000 site. Both PrimeGrid and RPS have proof codes for anonymous individuals and have used them extensively. This is the first time that CRUS has had one.
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Old 2021-09-24, 10:09   #985
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279*798^235749-1 is prime!

R798 is now a 3k'er.
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Old 2021-09-25, 18:15   #986
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38*977^299737+1 found by whizbang (896184 digits)
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Old 2021-09-28, 14:48   #987
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162*814^233173+1 found by whizbang (678682 digits)
196*814^263256+1 found by grcpool.com-3 (766242 digits)
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Old 2021-10-01, 12:27   #988
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64*425^467857-1 is prime. This prime clocks in at 1229712 digits and proves R425. Woohoo!!!
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Old 2021-10-01, 19:27   #989
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Quote:
Originally Posted by rogue View Post
64*425^467857-1 is prime. This prime clocks in at 1229712 digits and proves R425. Woohoo!!!

A big congrats on a huge prime and proof!


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Old 2021-10-01, 20:11   #990
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Quote:
Originally Posted by gd_barnes View Post
A big congrats on a huge prime and proof!


I got lucky, which I won't complain about. I just started testing the range about a week ago and since this k has a light weight, wasn't expecting to find a prime. The primality test took more than a day with LLR:

Base factorized as : 5^2*17
Base prime factor(s) taken : 5, 17
Starting N+1 prime test of 64*425^467857-1
Using FMA3 FFT length 448K, Pass1=448, Pass2=1K, clm=4, a = 3
64*425^467857-1 may be prime. Starting Lucas sequence...
Using FMA3 FFT length 448K, Pass1=448, Pass2=1K, clm=4, P = 4
64*425^467857-1 may be prime, trying to compute gcd's
U((N+1)/17) is coprime to N!
U((N+1)/5) is coprime to N!
64*425^467857-1 is prime! (1229712 decimal digits, P = 4) Time : 108946.064 sec.

This is compared to a PRP test for the previous candidate on the same CPU:

64*425^467761-1 is not prime. RES64: AF05EBF82647AB5A. OLD64: 4C8B49ECEACF6D8D Time : 16277.097 sec.
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