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Old 2010-10-08, 20:21   #826
Flatlander
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Wow! That's NPLB's biggest find.
Huge congratulations!
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Old 2010-10-08, 20:21   #827
Batalov
 
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Phi(4,2^7658614+1)/2

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357·2^1019004-1 (306754 digits)
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Old 2010-10-08, 20:24   #828
Flatlander
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Quote:
Originally Posted by Batalov View Post
357·2^1019004-1 (306754 digits)
That's a beautiful sight!
Some tasty primes falling today!

Last fiddled with by Flatlander on 2010-10-08 at 20:24
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Old 2010-10-08, 21:53   #829
mdettweiler
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Quote:
Originally Posted by unconnected View Post
301*2^1801207-1 ‏(‎542220 digits)
Amazing find--a huge congratulations for breaking the record for NPLB's biggest prime to date!

Also congrats to Batalov; one question though. I see that the prime was reported as having been found and proven with PFGW; is this an error, or are you actually using PFGW to search this? While there is no speed advantage to using one particular gwnum-based program over another for this kind of search, we do prefer that people use LLR for NPLB work so that the residues are compatible with future doublechecks. PFGW and Prime95 produce PRP residues, so they'll need to be doublechecked as such (which means needing to treat those separately from an otherwise straightforward doublecheck run).
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Old 2010-10-08, 22:00   #830
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Congrats Dmitry on NPLB's largest prime to date!
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Old 2010-10-08, 23:42   #831
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Quote:
Originally Posted by mdettweiler View Post
...one question though. I see that the prime was reported as having been found and proven with PFGW; is this an error, or are you actually using PFGW to search this? While there is no speed advantage to using one particular gwnum-based program over another for this kind of search, we do prefer that people use LLR for NPLB work so that the residues are compatible with future doublechecks. PFGW and Prime95 produce PRP residues, so they'll need to be doublechecked as such (which means needing to treat those separately from an otherwise straightforward doublecheck run).
I see. Actually, I used Prime95 26.2 for PRP (created the p291 code and missed Prime95... this is being fixed now by email). For me, it was just a test of speed and of Prime95 26.2; I didn't mean to continue larger than these two small 1000-1020 ranges (because I've booked a new range at Phil's "One-or-bust"). I will email the PRP residues when finished.
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Old 2010-10-08, 23:46   #832
mdettweiler
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Quote:
Originally Posted by Batalov View Post
I see. Actually, I used Prime95 26.2 for PRP (created the p291 code and missed Prime95... this is being fixed now by email). For me, it was just a test of speed and of Prime95 26.2; I didn't mean to continue larger than these two small 1000-1020 ranges (because I've booked a new range at Phil's "One-or-bust"). I will email the PRP residues when finished.
Ah, I see. In that case, then, no problem--sometime down the road before we start doublechecking this range in earnest I'll go over the PRP-residue first-pass results myself so as to get compatible doublecheck residuals in the database right off the bat. Since the two ranges you did are very small, this shouldn't take much CPU effort on my part.
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Old 2010-10-10, 17:12   #833
Sloth
 
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445*2^910881-1
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Old 2010-10-10, 23:36   #834
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345*2^1175842-1 is prime
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Old 2010-10-19, 21:37   #835
marco.bs
 

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511*2^921397-1 is prime! (my first on NPLB, thanks!)
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Old 2010-10-20, 05:25   #836
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Nice one Marco!
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