PrimeGrid
Please visit donation page to help the project cover running costs for this month

Toggle Menu

Join PrimeGrid

Returning Participants

Community

Leader Boards

Results

Other

drummers-lowrise

Advanced search

Message boards : Number crunching : Primeform's pseudoprimes?

Author Message
Kevin
Send message
Joined: 22 Jun 10
Posts: 17
ID: 62741
Credit: 0
RAC: 0

Message 24827 - Posted: 10 Jul 2010 | 13:50:48 UTC
Last modified: 10 Jul 2010 | 13:51:35 UTC

I was running Pform, looking for some primorial-based primes. After it reached k * 11# +1, I noticed the following message:
378*p(5)#+1 is probable prime! (a = 1871) (digits:6)
Verification failed !? (a = 1889)


The number was 873181, which turned out to be 661 * 1321. I doubt that it is a Pform pseudoprime. I'll run some more tests to either prove or disprove that it is a psedudoprime.

Message boards : Number crunching : Primeform's pseudoprimes?

[Return to PrimeGrid main page]
DNS Powered by DNSEXIT.COM
Copyright © 2005 - 2022 Rytis Slatkevičius (contact) and PrimeGrid community. Server load 0.00, 0.00, 0.00
Generated 26 Sep 2022 | 7:23:48 UTC