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Old 2005-01-27, 03:52   #1
Citrix
 
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Jun 2003

2·5·157 Posts
Default Sierpinski base 4

I have a slow computer that won't be of much help to the PSP project, so I am working on this problem on that computer. If anyone has any computers that won't be of much help to PSP can consider to help with this

66741 is the smallest number (k) that is a multiple of 3 and k*4^n+1 is never prime!

THe following k and n are left: (20), Please eliminate. Use Newpgen and LLR 3.5. Remember to enter base 4 than 2.
Post below to reserve a k. The aim is to take all the k's to 100,000 and then stop.



Scores
Mark 3
Footmaster 3
Citrix 0
Jean Penne 1
Mystwalker 1
masser 1

k Upper limit Relative weight Reserved by
5886 10000 92 Citrix
8139 10000 86 Citrix
18534 50000 80 Citrix
23451 46000 332 Mystwalker
23799 10000 268
33771 10000 142 Jean Penne
33879 20000 716 Mystwalker
34914 10000 455
35874 10000 448
41709 10000 410 Geoff
42717 10000 622 Geoff
49386 10000 319
51171 10000 731 masser
53226 10000 177 Carlos
55611 20000 536
60849 10000 387
60891 10000 275
63411 10000 316
64494 10000 272 Keller
66741 Sierpinski number for base 4


9 primes found so far!
15441*2^20584+1 is prime! Time: 1.172 sec. by Footmaster
21069*2^23006+1 is prime! Time: 1.751 sec. by Footmaster
21699*2^72874+1 is prime! Time: 21.318 sec. by Footmaster
14661*2^91368+1 is prime! Time: 42.331 sec. by Jean Penne
58791*2^79420+1 is prime! Time: 27.092 sec. by Mystwalker
52839*2^32558+1 is prime! Time: 2.640 sec. by masser
50166*4^12490+1 is prime! by Mark
45306*4^14484+1 is prime! by Mark
30579*4^24297+1 is prime! by Mark


Have fun eliminating these!

Last fiddled with by Citrix on 2005-01-27 at 23:22
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