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MartinBell

Joined: 8 Jul 19
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Message 131235 - Posted: 18 Jul 2019 | 21:37:23 UTC

Hi hope everyone has been keeping ok?

I have been sticking to the PPSE work units I have completed over 1800 Work units on CPU, will I have to complete a lot more to find a prime. which i more than happy to do.

I have also found four AP20s here is my first find 200192410653469237+138288308*23#*n for n=0..19 have I discovered my first prime?

I have also been running Generalized Fermat GFN-15 on GPU, what is the diffrence between GFN-15 up to GFN World Record, is that the higher the number i.e GFN-16 and onwards the longer the prime number will be?

Can someone explain what the diffrence between GFN projects and PPSE is? please,

Thank you.

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Usucapio Libertatis

Joined: 21 Apr 10
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Message 131238 - Posted: 18 Jul 2019 | 22:19:40 UTC - in response to Message 131235.

Lame answer (someone else will be able to provide a better one):
The higher the number next to GFN, the longer it will take to complete. From a few seconds on GFN 15 to several days (or even weeks) on GFN world record.
The latter name means that if a GFN WR candidate turns out to be prime, it would be the largest prime number ever found.

PPS and GFN have the same purpose: find prime Numbers. They use different software (although both run within Boinc). PPS is currently CPU online while GFN runs on CPU or GPU.

Welcome to Primegrid.
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676754^262144+1 is prime

Dave

Joined: 13 Feb 12
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Message 131247 - Posted: 19 Jul 2019 | 6:04:48 UTC - in response to Message 131238.

"GFN-WR" is a misnomer now for a few years since GIMPS found the new world's biggest, that's what DYFL is for. The front page shows you predicted world position for each project.

Usucapio Libertatis

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Message 131261 - Posted: 19 Jul 2019 | 14:07:34 UTC - in response to Message 131247.

"GFN-WR" is a misnomer now for a few years since GIMPS found the new world's biggest, that's what DYFL is for. The front page shows you predicted world position for each project.

The GFN-WR Project is now called "Do you feel lucky". The largest prime found by GIMPS has 24862048 digits. If we were lucky enough to find a (GFN) prime running tasks from "Do you feel lucky", it would be the largest prime ever found.
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676754^262144+1 is prime

Michael Goetz
Volunteer moderator
Project scientist

Joined: 21 Jan 10
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Message 131262 - Posted: 19 Jul 2019 | 14:22:12 UTC - in response to Message 131261.

The GFN-WR Project is now called "Do you feel lucky".

Um... not exactly.

GFN-WR is now called GFN-22, although its internal, immutable name must remain genefer_wr.

DYFL (Do You Feel Lucky?) is an entirely new project. It fulfills the same purpose as GFN-WR used to fulfill, but it's a different project.

GFN-WR as a project name no longer exists.
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My lucky number is 75898524288+1

Usucapio Libertatis

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Message 131267 - Posted: 19 Jul 2019 | 14:58:22 UTC - in response to Message 131262.

The GFN-WR Project is now called "Do you feel lucky".

Um... not exactly.

GFN-WR is now called GFN-22, although its internal, immutable name must remain genefer_wr.

DYFL (Do You Feel Lucky?) is an entirely new project. It fulfills the same purpose as GFN-WR used to fulfill, but it's a different project.

GFN-WR as a project name no longer exists.

I stand corrected (I misread Dave's post).
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676754^262144+1 is prime

Ravi Fernando
Project scientist

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Message 131363 - Posted: 22 Jul 2019 | 7:24:06 UTC - in response to Message 131235.

I have also found four AP20s here is my first find 200192410653469237+138288308*23#*n for n=0..19 have I discovered my first prime

There was some discussion of that question here. It's a surprisingly philosophical question. Those 20 primes are small enough that some computer probably
noticed their primality before you, but probably no human did. And really, 18-digit primes are so easy to find (e.g. type some random numbers in here) that the only interesting thing about them is that they form an AP--which is exactly what you discovered.

In any case, congrats on the discoveries, and keep up the good work--I see you've already passed me in total credit.

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