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-   -   Sierpinski/Riesel Base 5: Post Primes Here (https://www.mersenneforum.org/showthread.php?t=3125)

 Footmaster 2005-06-07 12:38

78002*5^40115+1 is Prime!

 geoff 2005-06-08 04:17

Please post reservations and results etc. in the reservations thread, it makes it easier for me to keep track of them, and also easier to see what is still available if others make a reservation before I get around to updating the table.

Post a copy of the primes found to this thread if you want, as I will delete the messages in the reservations thread when the tables are updated.

 axn 2005-06-14 05:37

137336*5^47704-1 is prime!

 ValerieVonck 2005-06-14 18:02

53858*5^89840 - 1 is prime! 62801 digits

Woohoo!!!

 ValerieVonck 2005-06-15 09:00

BTW this is a top 5000 prime:

[url]http://primes.utm.edu/primes/page.php?id=74786[/url]

 geoff 2005-06-15 17:27

[QUOTE=CedricVonck]53858*5^89840 - 1 is prime! 62801 digits[/QUOTE]
You found the prime 53858*5^33760-1 earlier, so this k has already been eliminated...

 ValerieVonck 2005-06-15 20:25

[QUOTE=geoff]You found the prime 53858*5^33760-1 earlier, so this k has already been eliminated...[/QUOTE]

?? Is this not a project like "primesearch"??

 geoff 2005-06-17 17:29

[QUOTE=CedricVonck]?? Is this not a project like "primesearch"??[/QUOTE]
Not quite, we are trying to find a prime of the form k*5^n+1 (resp. k*5^n-1) to show that k is not a Sierpinski (resp. Riesel) number. One prime for each k is sufficient. I think it makes sense to record the smallest prime for each k, since this will minimise the time needed to verify the final proofs.

 axn 2005-06-19 06:07

203036*5^22928-1 is prime!
203036*5^27604-1 is prime! (<-- Redundant)

 axn 2005-06-21 07:57

145114*5^31459-1 is prime!

 axn 2005-06-21 09:08

214958*5^20254-1 is prime!

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