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Old 2006-03-17, 18:57   #1
Kosmaj
 
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Cool The Second RPS Drive

In the second RPS drive we'll search for primes k*2^n-1 for 20 small k's
107 <= k <= 239
in the n=210000-600000 range.

Please reserve one or more files from the list below, and when you are done kindly mail your results to Kosmaj. If you find a prime that qualifies for Top-5000 primes please report it there and either to this thread or the Post Primes Here thread. If you find a prime that doesn't qualify for Top-5000 report it to this thread only. I'll report completed ranges to Wilfrid Keller as "completed by RPS".

Since we'd like not only to find primes but also to report completed ranges to Keller please run the files only on reliable machines using reliable LLR clients.

Note that some reportable primes for these k's have been already found, I'll post the list in a separate message. If you find one of those, please just report it to this thread.

All found primes are listed on the "Riesel list k<300" status page.
Number of new primes found per k:
Code:
107 3 	 145 3	  179 3	   227 2
115 2 	 149 1	  181 11   229 2
131   	 167 4	  185 6	   233
133 3 	 169 1 	  187 3	   235 3
143 2 	 175 6	  221  	   239 1

Total number of new primes found so far:  56
Result files
210-270k: text (3.4M), zip (800k).
270-330k: text (3.4M), zip (800k).
330-400k: zip (920k)
400-500k: zip (1.3M)
500-600k: zip (1.3M)
All primes found in the n=210-600k range: 56 new primes, and 5 confirmed.

Code:
     Range          Tested by
210,000-495,000 - RPS         - Complete
495,000-500,000 - segmtfault  - Complete
500,000-550,000 - RPS         - Complete
550,000-552,000 - Kosmaj      - Complete
552,000-553,000 - amphoria    - Complete 
553,000-554,000 - LSoule      - Complete (Prime: 181 553989)
554,000-555,000 - amphoria    - Complete 
555,000-557,000 - Thomas      - Complete (Prime: 235 556077)
557,000-558,000 - Kosmaj      - Complete
558,000-560,000 - LSoule      - Complete
560,000-561,000 - amphoria    - Complete (Prime: 229 560259)
561,000-562,000 - LSoule      - Complete
562,000-563,000 - amphoria    - Complete
563,000-564,000 - Kosmaj      - Complete (Prime: 181 563997)
564,000-566,000 - Thomas      - Complete
566,000-567,000 - Battlemaxx  - Complete
567,000-568,000 - Kosmaj      - Complete
568,000-570,000 - LSoule      - Complete
570,000-571,000 - amphoria    - Complete
571,000-572,000 - LSoule      - Complete
572,000-573,000 - amphoria    - Complete
573,000-575,000 - Thomas      - Complete
575,000-577,000 - Kosmaj      - Complete
577,000-578,000 - LSoule      - Complete
578,000-579,000 - amphoria    - Complete
579,000-580,000 - LSoule      - Complete
580,000-581,000 - amphoria    - Complete
581,000-582,000 - Battlemaxx  - Complete
582,000-583,000 - LSoule      - Complete
583,000-584,000 - Kosmaj      - Complete
584,000-586,000 - amphoria    - Complete
586,000-587,000 - Kosmaj      - Complete (Prime: 229 586795)
587,000-590,000 - LSoule      - Complete
590,000-591,000 - Kosmaj      - Complete
591,000-592,000 - VBCurtis    - Complete
592,000-594,000 - amphoria    - Complete (Prime: 149 592968)
594,000-595,000 - Kosmaj      - Complete
595,000-596,000 - LSoule      - Complete
596,000-597,000 - Kosmaj      - Complete
597,000-598,000 - amphoria    - Complete
598,000-599,000 - LSoule      - Complete
599,000-600,000 - Kosmaj      - Complete
Sieved to 2536bn (2.53E12)
All files taken - The drive is over!

Last fiddled with by Kosmaj on 2006-11-04 at 10:09
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Old 2006-03-17, 19:04   #2
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Default Known primes

The following 5 primes have already been found by others. If you find one of them please just report about it to this thread.

149 212460 ... confirmed
229 220147 ... confirmed
235 231927 ... confirmed
133 238163 ... confirmed
107 267916 ... confirmed

Last fiddled with by lsoule on 2006-03-28 at 17:48
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Old 2006-03-17, 19:23   #3
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Taking 210-212
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Old 2006-03-17, 20:05   #4
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I'll take 212-214.
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Old 2006-03-18, 04:23   #5
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Taking 214-216
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Old 2006-03-18, 16:11   #6
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149*2^212460-1 confirmed to be prime.

Taking 216-218.
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Old 2006-03-18, 18:21   #7
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Taking 218-220
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Old 2006-03-18, 18:52   #8
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181*2^212647-1 is prime! (64016 digits)

Confirmed by pfgw. Too small for Top-5000 but this is the first new prime in the 2nd Drive
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Old 2006-03-18, 23:27   #9
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Congratulations :)

Taking 220-222
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Old 2006-03-19, 01:39   #10
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Taking 222-224
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Old 2006-03-19, 02:20   #11
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Quote:
Originally Posted by Kosmaj
The following 5 primes have already been found by others. If you find one of them please just report about it to this thread.

149 212460
229 220147
235 231927
133 238163
107 267916
As expected:
229*2^220147-1 is prime! Time : 80.412 sec.
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