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2019-01-15, 14:46   #133
robert44444uk

Jun 2003
Oxford, UK

22×3×7×23 Posts

Quote:
 Originally Posted by Bobby Jacobs I am excited to continue the prime gap search above 264. I really want to know what the next few maximal prime gaps are. When are we going to do it?
When someone can program it to be efficient!

There are various programs on PGS that can do it, but they operate over 100 times less efficiently that Robert Gerbicz's code which worked only up to 2^64

I am not aware of anyone who is currently looking in the area above and close to 2^64.

I'm currently looking at defined offsets from multiples of primorials in the gap length 2000 to 8000 range.

Last fiddled with by robert44444uk on 2019-01-15 at 14:55

 2019-02-23, 20:27 #134 Bobby Jacobs     May 2018 21210 Posts Where is the code for finding gaps above 264? Can I please take a look?
 2019-05-01, 12:53 #135 Bobby Jacobs     May 2018 D416 Posts We could find the next maximal twin prime gap. That seems to be what people are doing now.
2019-05-01, 15:58   #136
robert44444uk

Jun 2003
Oxford, UK

193210 Posts

Quote:
 Originally Posted by Bobby Jacobs We could find the next maximal twin prime gap. That seems to be what people are doing now.
I expect to find 10 in the next week!

 2019-05-01, 17:50 #137 rudy235     Jun 2015 Vallejo, CA/. 24×61 Posts [wrong post] Last fiddled with by rudy235 on 2019-05-01 at 17:52 Reason: mistaken post
 2019-12-08, 22:37 #138 Bobby Jacobs     May 2018 110101002 Posts The newest prime gap project is putting Dr. Nicely's gaps on this site.
2019-12-19, 01:11   #139
storm5510
Random Account

Aug 2009

19×101 Posts

Quote:
 Originally Posted by robert44444uk When someone can program it to be efficient! There are various programs on PGS that can do it, but they operate over 100 times less efficiently that Robert Gerbicz's code which worked only up to 2^64 I am not aware of anyone who is currently looking in the area above and close to 2^64. I'm currently looking at defined offsets from multiples of primorials in the gap length 2000 to 8000 range.
Greetings. This is something I thought about after I began running Prime95 back in 2005. I have been a hobby programmer since 1988 after I started at a local community college. I tried writing some of my own code. This was greatly restricted in size at the time. Running 2^45 was about all I could do.

I have something different now which has a big-integer library. I wrote a short test and had it display 2^1200 in decimal. In just a key press, the screen was full.

More recently, I wrote my own program to do gap searches. It has been an ongoing project performing tests, and more tests. Is it capable of going beyond 2^64? Most definitely. Is it efficient? Probably not. I have no understanding of advanced math, so I did this in such a way that I could understand what I was doing. This is where any inefficiency would begin. For someone 64 years old, I do the best I can.

 2020-09-24, 22:44 #140 Bobby Jacobs     May 2018 22·53 Posts What is the next prime gap project now?
 2020-09-25, 12:45 #141 mart_r     Dec 2008 you know...around... 10011111102 Posts Bobby, please stop doing that. Anyway, while we're at it... @ ATH: I'd still be interested to know a bit more about your calculation above 264 here: https://www.mersenneforum.org/showpo...0&postcount=69 Calculation time or throughput / specs of the PC / availability/distributability (is that a word?) of the program? Some people might be interested in taking the calculation further, even if it's rather inefficient...

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