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Old 2014-10-03, 00:48   #5
Trilo
 
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"W. Byerly"
Aug 2013
1423*2^2179023-1

2·72 Posts
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Update:

4207: None [851k]

4329: 263133, 340355, 343403 [427k]

4347: 292512, 330224 [454k]

4431: 293087, 309253, 402299, 410231 [444k]

Reserving k= 1423 from n= 1M- n= 2M. Already tested to n= 1.25M primes: 1423*2^1205415- 1 (362, 870 digits)

Also unreserving k= 20055 tested up to 100k no new primes from last report.
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