mersenneforum.org Sieving drive for k=1005-2000 n=200K-500K
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 2009-01-14, 12:14 #100 gd_barnes     May 2007 Kansas; USA 23·1,301 Posts P=8800G-10000G is complete. no primes found many possible primes were eliminated though!
 2009-01-14, 12:39 #101 IronBits I ♥ BOINC!     Oct 2002 Glendale, AZ. (USA) 21318 Posts Scrub a dub dub :thumbs:
 2009-01-14, 13:43 #102 IronBits I ♥ BOINC!     Oct 2002 Glendale, AZ. (USA) 21318 Posts sieve 1005-2000-200K-500K done, factors emailed to Gary.
2009-01-14, 13:50   #103
em99010pepe

Sep 2004

283010 Posts

Quote:
 Originally Posted by IronBits sieve 1005-2000-200K-500K done, factors emailed to Gary.
Now you can test your Core i7 on IB9000.

2009-01-14, 14:33   #104
Mini-Geek
Account Deleted

"Tim Sorbera"
Aug 2006
San Antonio, TX USA

17·251 Posts

Quote:
 Originally Posted by gd_barnes P=8800G-10000G is complete. no primes found
Naw, really?

2009-01-15, 05:27   #105
gd_barnes

May 2007
Kansas; USA

23·1,301 Posts

Quote:
 Originally Posted by Mini-Geek Naw, really?

I was wondering if anyone would catch that.

Funny thing...I actually started to type that out of habit and then said what the heck am I doing? Then I just went with it. lol

If anyone finds a prime n>100K while sieving, let me know. We'll award you a gold medal! I say n>100K because srsieve will actually "announce" small primes on the screen if you sieve starting at an extremely low n-value like n=1.

 2009-01-15, 06:14 #106 gd_barnes     May 2007 Kansas; USA 101000101010002 Posts Re-reserving Nugget's range of P=8200G-8600G. We can't wait any longer for it. Perhaps he'll show up midway through and I'll be able to stop. I think a quad will slay it fast enough. If not, I'll put 2 on it. Gary
2009-01-15, 16:31   #107
Mini-Geek
Account Deleted

"Tim Sorbera"
Aug 2006
San Antonio, TX USA

10000101010112 Posts

Quote:
 Originally Posted by gd_barnes I say n>100K because srsieve will actually "announce" small primes on the screen if you sieve starting at an extremely low n-value like n=1.
I assume this is just because it sieves past the square root of the number without finding anything, right? How long would it take (I know it'll be way, way past the realm of practicality, and probably possibility as well) to confirm via sieving only, with sr*sieve or NewPGen or something, (maybe include Prime95?) that a number with n>100K is prime?

2009-01-15, 16:54   #108
henryzz
Just call me Henry

"David"
Sep 2007
Cambridge (GMT/BST)

2·17·173 Posts

Quote:
 Originally Posted by Mini-Geek I assume this is just because it sieves past the square root of the number without finding anything, right? How long would it take (I know it'll be way, way past the realm of practicality, and probably possibility as well) to confirm via sieving only, with sr*sieve or NewPGen or something, (maybe include Prime95?) that a number with n>100K is prime?
almost right
it doesnt do square root for some reason although it would be very nice if it did

2009-01-16, 01:25   #109
gd_barnes

May 2007
Kansas; USA

23×1,301 Posts

Quote:
 Originally Posted by Mini-Geek I assume this is just because it sieves past the square root of the number without finding anything, right? How long would it take (I know it'll be way, way past the realm of practicality, and probably possibility as well) to confirm via sieving only, with sr*sieve or NewPGen or something, (maybe include Prime95?) that a number with n>100K is prime?

Henry is correct. For example, if you are sieving and just happen to have k*2^n-1 calculate to a value of 101; srsieve will not display it as prime until it has sieved to P=101.

This is OK as far as I'm concerned because srsieve will actually correctly leave the pair in the sieve. sr1sieve and sr2sieve either barf at such a low pair or improperly remove them. NewPGen is extremely bad about that; it actually removes them from the sieve without saying a word. For that reason, I never use NewPGen anymore except for twin-prime sieving at higher n-ranges. Also, it's far too slow.

Gary

 2009-01-16, 08:32 #110 MyDogBuster     May 2008 Wilmington, DE 1011001001002 Posts 4250G - 5850G Complete Results emailed I still owe you 4050G - 4250G Sometime tonight

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