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 2010-01-10, 02:22 #606 gd_barnes     May 2007 Kansas; USA 2×3×7×241 Posts 2611*2^523299-1 is prime 2625*2^523524-1 is prime 2397*2^524086-1 is prime Last fiddled with by gd_barnes on 2010-01-12 at 08:15 Reason: add primes
 2010-01-13, 13:24 #607 Mini-Geek Account Deleted     "Tim Sorbera" Aug 2006 San Antonio, TX USA 17×251 Posts 2563*2^525151-1 is prime! I seem to have much better luck on NPLB than CRUS. I wonder if this is just chance or if there's something unknown about prime distribution on base 2 vs other bases...
2010-01-13, 16:51   #608
mdettweiler
A Sunny Moo

Aug 2007
USA (GMT-5)

141518 Posts

Quote:
 Originally Posted by Mini-Geek 2563*2^525151-1 is prime! I seem to have much better luck on NPLB than CRUS. I wonder if this is just chance or if there's something unknown about prime distribution on base 2 vs other bases...
It's probably not so much about the base as it is about the fact that CRUS's k's are extremely biased towards the low-weight end of the spectrum: after all, there's a reason why they've held on as long as they have without a prime. NPLB, on the other hand, is searching a very large contiguous k-range, which is quite ideal for finding lots of primes.

 2010-01-16, 21:07 #609 gd_barnes     May 2007 Kansas; USA 2×3×7×241 Posts 1731*2^667435-1 is prime 1875*2^667853-1 is prime Last fiddled with by gd_barnes on 2010-01-18 at 03:17 Reason: add prime
 2010-01-19, 05:31 #610 vaughan     Jan 2005 Sydney, Australia 5×67 Posts 1879*2^668517-1 is prime. Found by my little ASUS eeePC 701
2010-01-19, 16:22   #611
henryzz
Just call me Henry

"David"
Sep 2007
Cambridge (GMT)

2×3×23×41 Posts

Quote:
 Originally Posted by vaughan 1879*2^668517-1 is prime. Found by my little ASUS eeePC 701
impressive for such a slow pc

 2010-01-21, 05:49 #612 gd_barnes     May 2007 Kansas; USA 100111100010102 Posts 2223*2^525476-1 is prime 2643*2^525528-1 is prime 2715*2^525530-1 is confirmed prime 2691*2^525606-1 is prime 2717*2^526016-1 is prime 2829*2^526483-1 is prime 2941*2^526493-1 is confirmed prime 2183*2^527764-1 is prime 2537*2^528164-1 is prime 1549*2^669387-1 is prime Last fiddled with by gd_barnes on 2010-01-28 at 11:21 Reason: add primes
 2010-01-29, 01:46 #613 vaughan     Jan 2005 Sydney, Australia 5·67 Posts 2445*2^528423-1 already in database
 2010-01-29, 08:54 #614 vaughan     Jan 2005 Sydney, Australia 5·67 Posts 2429*2^528680-1 is prime
 2010-01-29, 10:28 #615 vaughan     Jan 2005 Sydney, Australia 5·67 Posts 2575*2^528713-1 is prime
 2010-01-30, 11:00 #616 gd_barnes     May 2007 Kansas; USA 2·3·7·241 Posts 2379*2^529181-1 is prime 2259*2^529340-1 is prime 2067*2^529888-1 is prime 2533*2^531163-1 is prime 2993*2^531362-1 is prime 2397*2^531494-1 is prime 2543*2^531924-1 is prime 2395*2^532313-1 is prime Last fiddled with by gd_barnes on 2010-02-05 at 06:15 Reason: add primes

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