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Old 2003-06-21, 01:03   #1
jocelynl
 
Sep 2002

10616 Posts
Default Status of 210885

L15
Here is the current list of primes for the sequence 210885*2^n-1
n={2, 4, 7, 11, 12, 19, 31, 33, 36, 46, 67, 73, 74, 86, 89, 112, 116, 156, 213, 217, 223, 260, 275, 276, 290, 351, 355, 370, 374, 529, 604, 607, 633, 651, 693, 705, 729, 799, 836, 856, 867, 886, 1005, 1036, 1162, 1190, 1479, 1862, 2219, 2449, 2786, 2875, 2925, 2996, 3980, 4736, 4824, 5001, 5331, 5595, 9551, 11270, 11403, 12530, 12573, 12804, 13351, 13416, 14764, 16595, 17290, 17732, 18299, 18991, 24974, 26794, 27723, 31126, 32896, 34037, 34224, 54044, 54716, 55336, 57180, 63549, 69671, 76716, 87224, 103466, 109235, 115579, 124415, 124985, 126773, 145659, ...}

Joss
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Old 2003-08-01, 01:01   #2
TTn
 

2·1,723 Posts
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Thats really nice!
But unfortunately I dont encourage everyone to post primes less than the minimum requirement. It takes up to much disc space in the forum for every one to do this. :(

Thank you,
Very nice 15k though!
:(
 
Old 2003-08-01, 06:20   #3
Xyzzy
 
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Aug 2002

2×19×223 Posts
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If that was all it was it wouldn't be so bad...

Listing all the digits is not a good idea...
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Old 2003-09-10, 23:21   #4
jocelynl
 
Sep 2002

2×131 Posts
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210885*2^156655-1 is prime and is the 96th prime in the sequence.

joss
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Old 2003-09-19, 13:47   #5
jocelynl
 
Sep 2002

26210 Posts
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210885*2^164059-1 is prime and is the 97th in sequence

Joss
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Old 2003-09-19, 16:45   #6
tom11784
 
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Aug 2003
Upstate NY, USA

14616 Posts
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cmon 100 - :)
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Old 2003-10-16, 17:53   #7
jocelynl
 
Sep 2002

2×131 Posts
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210885*2^183815-1 is prime and is the 98th in sequence

Joss
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Old 2003-10-22, 17:28   #8
jocelynl
 
Sep 2002

1000001102 Posts
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210885 195687 is also prime!
and since I miscounted the first ones, this is the 100th in the sequence

Joss
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Old 2003-11-05, 13:34   #9
jocelynl
 
Sep 2002

2·131 Posts
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210885*2^213029-1 is prime! and is the 101st in the sequence

Joss L15

Last fiddled with by jocelynl on 2003-11-05 at 13:35
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Old 2003-11-15, 21:39   #10
SlashDude
 
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Aug 2002
Minneapolis, MN

3448 Posts
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Josh,
How did you pick this 15k? I don't see it listed in the select a 15k thread...

I'm almost done testing the group of 15k's that I selected, and this one has a much lower #of tests to primes found then the other ones! 16995 is the next closest, with about the same number of tests needed for n < 100,000, but 210885 has 13 more primes in the same range!!! (FYI - 16995 has 90 primes in it's series up to n=282003)

I should have all the numbers complete in a day or two. I'll post em' all to compare when they are done.

The reason I was wondering how you picked it was to see if there is a way for us to try some other 15k's that have the same or better ratio of primes per # of tests.

Thanks!!
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