Sierpinski/Riesel Base 5: Post Primes Here - Page 6

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:

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

geoff · 2005-06-15, 17:27

Quote:

Originally Posted by CedricVonck

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

You found the prime 53858*5^33760-1 earlier, so this k has already been eliminated...

ValerieVonck · 2005-06-15, 20:25

Quote:

Originally Posted by geoff

You found the prime 53858*5^33760-1 earlier, so this k has already been eliminated...

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

geoff · 2005-06-17, 17:29

Quote:

Originally Posted by CedricVonck

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

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!

2005-06-14, 18:02	#59
ValerieVonck Mar 2004 Belgium 1101001001₂ Posts	538585^89840 - 1 is prime! 62801 digits Woohoo!!! Last fiddled with by ValerieVonck on 2005-06-14 at 18:02*

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2005-06-07, 12:38	#56
Footmaster Mar 2004 3·13 Posts	78002*5^40115+1 is Prime!

2005-06-08, 04:17	#57
geoff Mar 2003 New Zealand 13·89 Posts	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.

2005-06-14, 05:37	#58
axn Jun 2003 31×163 Posts	137336*5^47704-1 is prime!

2005-06-15, 09:00	#60
ValerieVonck Mar 2004 Belgium 29² Posts	BTW this is a top 5000 prime: http://primes.utm.edu/primes/page.php?id=74786

2005-06-19, 06:07	#64
axn Jun 2003 1001110111101₂ Posts	2030365^22928-1 is prime! 2030365^27604-1 is prime! (<-- Redundant)

2005-06-21, 07:57	#65
axn Jun 2003 31×163 Posts	145114*5^31459-1 is prime!

2005-06-21, 09:08	#66
axn Jun 2003 31×163 Posts	214958*5^20254-1 is prime!