4th RPS Drive: 20 more Ks < 300

[Kosmaj]

Actually 21 Ks will be tested for primality in the following ranges of n.

Form k*2^n-1
k=205 and 215 ....... 250000 <= n <= 600000
k=203, 211, 217, 241, 
  245, 259, 263, 265,
  271, 275, 281, 283, 
  287, 293, 295, 299: 260000 <= n <= 600000
k=91 ................ 300000 <= n <= 600000
k=257 ............... 320000 <= n <= 600000
k=109 ............... 350000 <= n <= 600000

We are beginning tests at n=260k taking in account that k=91 is already tested to 300k, k=257 to 320k, and k=109 to 350k, therefore they are not included in test files below these limits (Edit: k=205 and 215 were tested from 250k).

We have sieved all above Ks from achieved limits on Keller's page and will do some gap filling later. The priority now is to find new primes

Sieveing to 3T done by Dave, Larry, Thomas, and me using ProthSieve but ksieve, NewPGen, and RieselSieve were also used.

Important: Please send results of LLR tests to Kosmaj. Thank you!

Result Files
n=250-400k: zip (1.6M)

Happy hunting!
Number of new primes found per k:

 91 3  	 215 1	  259 6	   281 	   299 1 
109  	 217 3	  263 	   283 
203 3	 241 3	  265 1	   287 1
205 2	 245  	  271 4	   293 2
211 1	 257 1    275 1	   295 2 

Total number of new primes found so far:  35

The primes are listed on the k<300 Stats page

     Range        Tested by      Status
250,000-570,000 - RPS         - Complete (35 primes found)
570,000-571,000 - LSoule      - Complete
571,000-572,000 - Arminius    - Complete
572,000-573,000 - amphoria    - Complete
573,000-575,000 - Kosmaj      - Complete
575,000-576,000 - Arminius    - Complete
576,000-578,000 - LSoule      - Complete
578,000-580,000 - amphoria    - Complete
580,000-581,000 - Kosmaj      - Complete
581,000-582,000 - Arminius    - Complete
582,000-583,000 - LSoule      - Complete
583,000-584,000 - Arminius    - Complete
584,000-585,000 - amphoria    - Complete
585,000-587,000 - Kosmaj      - Complete
587,000-590,000 - Thomas      - Complete
590,000-591,000 - amphoria    - Complete
591,000-593,000 - Kosmaj      - Complete
593,000-594,000 - VBCurtis    - Complete
594,000-595,000 - amphoria    - Complete
595,000-597,000 - Kosmaj      - Compelte
597,000-598,000 - Thomas      - Complete
598,000-599,000 - amphoria    - Complete
599,000-600,000 - Kosmaj      - Complete

Available Files, sieved to 3T.
All files processed!
The Drive is over.

[lsoule]

Taking 260-262

[Kosmaj]

I'll take the next one 262-264

[grobie]

Taking 264 to 266

[ValerieVonck]

Taking

266to268.txt 1140
268to270.txt 1156

[amphoria]

Taking 270-272.

[lsoule]

Taking 272-274

[grobie]

264 to 266 complete (No Primes)

[lsoule]

260-262 complete, no primes
Taking 274-276

[amphoria]

270-272 complete, no primes.

Taking 276-278.

[Kosmaj]

Taking also 278-280.

Congrats to Larry on the first prime in the 4th Drive:
271*2^274509-1
but maybe there are smaller ones.