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Forum: Prime Gap Searches 2020-12-15, 17:19
Replies: 41
Views: 1,632
Posted By robert44444uk
Hi Seth Hmm, something went wrong today - I...

Hi Seth

Hmm, something went wrong today - I seem to have lost a key file. Can you tell me what I must do to repair or start afresh?

gap stats went well, as did the combined sieve

...
Forum: Prime Gap Searches 2020-12-13, 23:06
Replies: 41
Views: 1,632
Posted By robert44444uk
OpenPFGW has a stop on success capability, I seem...

OpenPFGW has a stop on success capability, I seem to remember

https://sourceforge.net/projects/openpfgw/

What command do I do to get openPFGW for Linux into my Ubuntu library?
Forum: Prime Gap Searches 2020-12-13, 12:34
Replies: 41
Views: 1,632
Posted By robert44444uk
Thanks Seth Installed on my big machine -...

Thanks Seth

Installed on my big machine - effortless this time.
The last few questions for today question:



$ ./gap_test.py --unknown-filename 907_53970_1_10000_s15000_l1000M.txt...
Forum: Prime Gap Searches 2020-12-13, 11:38
Replies: 41
Views: 1,632
Posted By robert44444uk
Trying to understand the input variables. In post...

Trying to understand the input variables. In post #1 you write



sieve to sieve m * P#/d for m from a to a+b up to limit

./combined_sieve --save-unknowns -p <P> -d <d> --mstart <a> --minc <b>...
Forum: Prime Gap Searches 2020-12-13, 10:57
Replies: 41
Views: 1,632
Posted By robert44444uk
Thanks Seth - I had actually figured that out in...

Thanks Seth - I had actually figured that out in the end. There were several more issues on the way after that but it was a question that I was running everything from scratch and I needed to run...
Forum: Prime Gap Searches 2020-12-11, 08:57
Replies: 41
Views: 1,632
Posted By robert44444uk
Well, that looks promising. So I can think if...

Well, that looks promising. So I can think if there is a Linux methodology to use Seth's program, then it should be possible to me to join in the fun.
Forum: Prime Gap Searches 2020-12-10, 18:06
Replies: 41
Views: 1,632
Posted By robert44444uk
Great f you can, Seth!

Great f you can, Seth!
Forum: Prime Gap Searches 2020-12-10, 11:59
Replies: 125
Views: 18,015
Posted By robert44444uk
Hi henryzz I think you are right, over the...

Hi henryzz

I think you are right, over the long run, deficient primorial offsets are not as efficient as defiicent primorials around the centre point, but they still provide a pretty sparse set of...
Forum: Prime Gap Searches 2020-12-10, 09:47
Replies: 41
Views: 1,632
Posted By robert44444uk
Hi Seth I don't know what software one needs...

Hi Seth

I don't know what software one needs to have, but searchers like me work in a Windows environment, or have the ability to emulate some other environments through a Windows shell.

Any...
Forum: Prime Gap Searches 2020-12-05, 10:24
Replies: 214
Sticky: Prime Gap News
Views: 35,847
Posted By robert44444uk
Love it :cool:

Love it :cool:
Forum: Prime Gap Searches 2020-12-02, 08:00
Replies: 214
Sticky: Prime Gap News
Views: 35,847
Posted By robert44444uk
I ran the program - it took about 2 seconds to...

I ran the program - it took about 2 seconds to produce the results below. It needs code in there to sort the file by absolute value of remaining candidates.

My strategy looked at a range of 1...
Forum: Prime Gap Searches 2020-11-28, 13:48
Replies: 214
Sticky: Prime Gap News
Views: 35,847
Posted By robert44444uk
For very large gaps I used the sieve_primes...

For very large gaps I used the sieve_primes routine and then pfgw. Here is a ready to use perl program - clearly change your variables. It produces a pfgw-ready file.


#!/usr/bin/env perl

#...
Forum: Puzzles 2020-11-28, 11:23
Replies: 34
Views: 1,479
Posted By robert44444uk
Got to love it. The newspapers need to be...

Got to love it.

The newspapers need to be told - the World needs to know :alien:

I suggest the Daily Mail or the Sun in the UK, and Fox News for the telly. And the boys and girls in QAnon, and...
Forum: Puzzles 2020-11-26, 11:01
Replies: 34
Views: 1,479
Posted By robert44444uk
Certainly not the smallest, but has some symmetry...

Certainly not the smallest, but has some symmetry and uses 5 operators, +,-,^,/,()
...
Forum: Prime Gap Searches 2020-11-14, 09:05
Replies: 214
Sticky: Prime Gap News
Views: 35,847
Posted By robert44444uk
Cool! The megagaps I found were based on a...

Cool!

The megagaps I found were based on a deep sieve of promising candidates (perl program) and pfgw for the intermediate composite checking. My largest gap (5m+) took three months to find.
Forum: Prime Gap Searches 2020-11-03, 15:46
Replies: 125
Views: 18,015
Posted By robert44444uk
Hi henryzz - generally speaking we do sieve over...

Hi henryzz - generally speaking we do sieve over A in our deficient primorial searches - A is favoured when 5mod30 or 25mod30, but others also get a look in - so I tend to look at...
Forum: Prime Gap Searches 2020-10-30, 15:39
Replies: 125
Views: 18,015
Posted By robert44444uk
There are two major approaches at the moment. ...

There are two major approaches at the moment.

Deficient primorials of the form A*p#/d form the majority of gap records, given that it is at a midpoint of a relatively smooth range 4 merits wide,...
Forum: Prime Gap Searches 2020-10-29, 09:54
Replies: 214
Sticky: Prime Gap News
Views: 35,847
Posted By robert44444uk
We can now add 117242 to that list

We can now add 117242 to that list
Forum: Prime Gap Searches 2020-10-29, 08:05
Replies: 125
Views: 18,015
Posted By robert44444uk
Hi Seth It would be useful, in this and your...

Hi Seth

It would be useful, in this and your other post, #98 if you could explain your variables - so what is "m", "d", "p" "X" - generally, for deficient primorial multiples we have tended to use...
Forum: Lounge 2020-10-26, 07:14
Replies: 1,632
RIP
Views: 128,486
Posted By robert44444uk
Kenneth Conrow RIP died 28 March 2019, - he is...

Kenneth Conrow RIP died 28 March 2019, - he is credited in the bibliography relating the search for prime gaps, but his prime gap records have all been superseded so that none of the current prime...
Forum: Prime Gap Searches 2020-10-24, 14:41
Replies: 214
Sticky: Prime Gap News
Views: 35,847
Posted By robert44444uk
I just found the second largest merit 30 gap...

I just found the second largest merit 30 gap ever:

The list will look like this when I post it - top 20 30-merit gaps


309030 31.7822 Rosnthal
214090 30.5885 RobSmith
203890 35.6402 RobSmith...
Forum: Prime Gap Searches 2020-10-24, 06:56
Replies: 214
Sticky: Prime Gap News
Views: 35,847
Posted By robert44444uk
Now found

Now found
Forum: Prime Gap Searches 2020-10-19, 08:29
Replies: 214
Sticky: Prime Gap News
Views: 35,847
Posted By robert44444uk
Very pretty - I would take the top of the CFC...

Very pretty - I would take the top of the CFC line and code as "Mersenne Prime Gap Search" (PGS) given the efforts of this group to get the search to 2^64 a couple of years back.

On a selfish...
Forum: Prime Gap Searches 2020-10-18, 07:28
Replies: 214
Sticky: Prime Gap News
Views: 35,847
Posted By robert44444uk
This graph just goes to show how puny our efforts...

This graph just goes to show how puny our efforts are, and how many really big (40+ merit) gaps there are out there!
Forum: Prime Gap Searches 2020-10-15, 11:33
Replies: 214
Sticky: Prime Gap News
Views: 35,847
Posted By robert44444uk
LGTM :)

LGTM :)
Showing results 1 to 25 of 1000

 
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