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-   -   17*2^n-1 (https://www.mersenneforum.org/showthread.php?t=5813)

grobie 2006-07-27 21:18

370,000 - 400,000 complete (No Primes) residue sent to Kosmaj

Kosmaj 2006-08-02 15:47

grobie is working on 400-450.

I'm still sieving the rest, currently at p=6.2T

grobie 2006-08-08 01:44

n=429318 Prime Confirmed

grobie 2006-08-11 09:11

[QUOTE=grobie]n=429318 Prime Confirmed[/QUOTE]
400 to 450 complete 1 confirmed prime.

Kosmaj 2006-09-09 02:27

The 450k-2M range is now sieved to 8T. There are 81632 candidates or 52.67 per 1000 n's. The prevailing opinion is that g167 most likely checked the range to n=601158 where he found a prime. Therefore, I'm releasing both 450-500k files which have a certain double-checking "flavor" and files from 600k where a new prime is more likely.

This is a long term project and we are not in hurry. Feel free to check one of these files as you like. But I'd like to propose the following: i[U]f/when somebody finds a prime at n>600k he is obliged to test a few n<600k files if by that time there are still some left unprocessed[/U] :smile:

BTW, here are FFT lengths used by LLR (versions 3.6 and 3.7) to test primality of 17*2^n-1 (output of Thomas' fft_len) on Pentium-4 cpu's:

[CODE] fftlen nmax
-----------------------
24576 454369
28672 528898
32768 604426
40960 751484
49152 895042
57344 1040800
65536 1191057
81920 1480573
98304 1765088
114688 2052604 [/CODE]

Kosmaj 2006-09-19 05:38

Taking 600-605.

segmtfault 2006-09-19 16:42

I'll take 605-610 and 610-615

lsoule 2006-09-20 04:36

Taking 615-620

Kosmaj 2006-09-20 05:46

Huge congrats to Alex on the first NEW k=17 prime found by RPS:
[B]17*2^605394-1[/B], 182243 digits :w00t: :cool:

I have to say I didn't expect anything before 620-630k, even higher. :surprised

This is now a one-way street, and primes are straight ahead!

segmtfault 2006-09-20 08:56

Thanks :george:
I didn't expect a prime so early myself :grin:
Well I guess you can already pre-reserve 450-460 for me then :razz:

Kosmaj 2006-09-20 09:15

All right, 450-460 is yours! :smile:

I'm also taking 620-625.


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