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Old 2015-12-24, 01:04   #397
diep
 
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k=733 , searched to n=4 million. Busy searching up to 5M. No new primes so far.

Hopefully more luck next year (or in the few days remaining of this year).
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Old 2016-01-01, 23:03   #398
firejuggler
 
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fermat,
20160101*2^n+1....
prime found so far :
20160101*2^5867+1
20160101*2^19977+1
20160101*2^21207+1
20160101*2^24393+1
20160101*2^27869+1
20160101*2^93615+1
20160101*2^98883+1
20160101*2^137747+1
20160101*2^169797+1
20160101*2^194597+1
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Old 2016-02-15, 11:25   #399
diep
 
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Quote:
Originally Posted by diep View Post
k=733 , searched to n=4 million. Busy searching up to 5M. No new primes so far.

Hopefully more luck next year (or in the few days remaining of this year).
Doh i must look in my logs whether i didn't do 3M-4M twice.
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Old 2017-05-16, 16:05   #400
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k=6371 from n=10000 to 100000
Found 1 prime:
6371*2^62318-1 is prime! (18764 decimal digits)
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Old 2017-06-20, 03:37   #401
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I filled some gaps recently on old old work, and found:
2115*2^607390-1 is prime.

I'll report completion status on the k>300 (choose your own k) thread.

Last fiddled with by VBCurtis on 2017-06-20 at 03:37
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Old 2017-08-29, 00:55   #402
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I have searched k = 17849 to a maximum n value of 1 M (starting from n =1), and the following primes were found:

17849*2^5448-1 (already found by Gallot)
17849*2^29840-1
17849*2^278912-1

Residue file is attached:
Attached Files
File Type: txt res-riesel-base2-k17849-to1M.txt (614.8 KB, 237 views)
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Old 2017-09-23, 20:16   #403
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I have searched k = 17851 to n = 500k (starting from n =1), and the following primes were found:

17851*2^5-1
17851*2^17-1
17851*2^61-1
17851*2^121-1
17851*2^529-1
17851*2^907-1
17851*2^1141-1
17851*2^1669-1
17851*2^5053-1
17851*2^5081-1
17851*2^12247-1
17851*2^40399-1
17851*2^42641-1
17851*2^45679-1
17851*2^72445-1
17851*2^103273-1
17851*2^169961-1
17851*2^280111-1
17851*2^320413-1

Residue file is attached:
Attached Files
File Type: txt res-riesel-base2-k17851-to500k.txt (880.3 KB, 143 views)
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Old 2020-02-02, 14:19   #404
storm5510
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1901*2^195870-1 is prime! (58967 decimal digits).
1901*2^239030-1 is prime! (71959 decimal digits)
1901*2^335018-1 is prime! (100854 decimal digits)

Passed 350,000.
Heading somewhere above 1,200,000 most likely.
Residue file attached.
Attached Files
File Type: zip Res64_1901_350K.zip (127.7 KB, 33 views)

Last fiddled with by storm5510 on 2020-02-02 at 14:29 Reason: Additional
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Old 2020-02-05, 00:41   #405
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k = 1901, n = 700K complete. Continuing...
srsieve / sr1sieve / llr
No new primes found. Residues attached.
Attached Files
File Type: zip K1901_N660K-N700K.zip (12.6 KB, 31 views)
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Old 2020-02-06, 16:45   #406
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k = 1901, n = 800K complete. Continuing...
srsieve / sr1sieve / llr
No new primes found. Residues attached.
Attached Files
File Type: zip K1901_N700e3-N800e3.zip (30.6 KB, 30 views)
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Old 2020-02-08, 02:42   #407
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If I read it right, the smallest value in the top 5000 list has 429,390 digits. Why separate ones larger here?
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