20060912, 14:06  #1 
Nov 2003
2×1,811 Posts 
15*2^n1, n>1M Reservation Thread
We are now ready to start testing 15*2^n1, n>1M. The first segment to 1.1M has been sieved to 11.3T by amphoria, Larry, Templus and me. The average number of candidates per file is 48.9.
Happy hunting! Found primes 15*2^10840101 (326321 digits) by Amphoria on Sep 28, 2006 15*2^13443131 (404680 digits) by Amphoria on Jan 5, 2007 15*2^18378731 (553257 digits) by mcduck on Dec 16, 2008 15*2^23232051 (699356 digits) by Thomas11 on Jul 11, 2011 15*2^36681941 (1104238 digits) by Ivica on Oct 15, 2013 Status Code:
Range Tested by Status 1,000,0003,000,000  RPS  Complete (4 primes) 3,000,0003,010,000  Pepi37  Complete 3,010,0003,130,000  Kosmaj  Complete 3,130,0003,150,000  Pepi37  Complete 3,150,0003,170,000  Kosmaj  Complete 3,170,0003,172,570  Pepi37  Complete 3,172,5703,200,000  Pepi37  Complete 3,200,0003,210,000  Kosmaj  Complete 3,210,0003,220,000  Pepi37  Complete 3,220,0003,300,000  Pepi37  Complete 3,300,0003,320,000  Pepi37  Complete 3,320,0003,400,000  Pepi37  Complete 3,400,0003,500,000  Pepi37  Complete 3,500,0003,600,000  Pepi37  Complete 3,600,0003,650,000  Pepi37  Complete 3,650,0003,800,000  Ivica  Complete (Prime: 15*2^36681941) 3,800,0003,803,000  Pepi37  Complete 3,803,0003,860,000  Ivica  Complete 3,860,0003,900,000  Thomas11  Complete 3,900,0004,080,000  Batalov  Complete 4,080,0004,400,000  Batalov  Complete 4,400,0004,700,000  Batalov  Complete 4,700,0004,800,000  Thomas11  Complete 4,800,0005,000,000  Thomas11  Complete 5,000,0005,200,000  Thomas11  Complete 5,200,0005,500,000  Thomas11  Complete 5,500,0005,800,000  Thomas11  In Progress The attached file contains the 45M range, including already tested ones. Please help yourself by extracting the range you want to test. Extensively sieved by Psieve. (36432 candidates). Last fiddled with by Thomas11 on 20180411 at 07:37 
20060912, 14:21  #2 
Nov 2003
2·1,811 Posts 
Number of primes
BTW, k=15 up to n=1M so far produced 50 primes, as follows:
Code:
#Digits #primes 21000 ....28 110k ......5 10100k ...12 100300k ...5 1, 2, 4, 5, 10, 14, 17, 31, 41, 73, 80, 82, 116, 125, 145, 157, 172, 202, 224, 266, 289, 293, 463, 1004, 1246, 2066, 2431, 2705, 4622, 5270, 7613, 21727, 21962, 40742, 41054, 60622, 83263, 83669, 91457, 103940, 104177, 108124, 115327, 161453, 172714, 454681, 568780, 656264, 712294, 902474 
20060912, 15:01  #3 
Nov 2004
California
2^{3}·3·71 Posts 
Taking 10001001!

20060912, 17:12  #4 
Jun 2003
Oxford, UK
19×103 Posts 
Good work!
Good work to the sievers, that's what I say.
Taking 10011002 Regards Robert Smith 
20060912, 19:42  #5 
Nov 2004
California
2^{3}×3×71 Posts 
Taking 10021003

20060913, 01:57  #6 
Nov 2003
111000100110_{2} Posts 
Taking 10031005.
As Larry informed me, on a 2.8GHz P4 it takes less than 23 hrs to process 50 candidates at n=1M. Therefore, for n>1010k I'll release test files in 2k chunks. Last fiddled with by Kosmaj on 20060913 at 02:33 
20060913, 14:06  #7 
Nov 2004
California
11010101000_{2} Posts 
10001001 complete, no primes
Taking 10051006 
20060913, 21:41  #8 
Nov 2004
California
2^{3}×3×71 Posts 
10021003 complete, no primes.
Taking 10061007 
20060914, 04:21  #9 
Nov 2003
2·1,811 Posts 
10031004 complete, no primes.
Taking 10071008. 
20060914, 11:53  #10 
Jun 2003
Oxford, UK
19×103 Posts 
Taking 1008  1010. 10011002 produced no primes
Regards Robert Smith 
20060914, 13:44  #11 
Nov 2004
California
1704_{10} Posts 
10051006 complete, no primes.
Taking 10101012 
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