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Forum: Five or Bust - The Dual Sierpinski Problem 2020-10-20, 18:48
Replies: 88
Views: 85,582
Posted By philmoore
Are there any other unresolved k values < 271129...

Are there any other unresolved k values < 271129 for which you do not have a probable prime?
Forum: Soap Box 2020-05-31, 19:13
Replies: 308
Views: 18,114
Posted By philmoore
I thought this claim had been pretty well...

I thought this claim had been pretty well discredited. Do you have a source for this, Ernst? My understanding is that when Biden called for Shokin's firing in March 2016, the investigation into...
Forum: Science & Technology 2020-04-02, 22:42
Replies: 461
Views: 39,338
Posted By philmoore
I climbed Mt. Borah four years ago and visited...

I climbed Mt. Borah four years ago and visited the site of the 7.0 normal fault event from 1983. Made an impression on me where the ground was thrust vertically on the eastern side of the fault eight...
Forum: Analysis & Analytic Number Theory 2020-02-22, 00:43
Replies: 7
Views: 8,480
Posted By philmoore
Do you mean the book by Cojocaru and Ram Murty? I...

Do you mean the book by Cojocaru and Ram Murty? I have recently begun studying it and have been enjoying it. I did bog down a couple years ago in Halberstam and Richert.
Forum: News 2019-01-12, 01:21
Replies: 270
Sticky: Lucky 13
Views: 29,974
Posted By philmoore
I found the larger of the two known prime factors...

I found the larger of the two known prime factors of M8191 in 2003 and did the computations at the time to show that the cofactor was not only composite, but was also not a power of a single prime...
Forum: News 2019-01-09, 22:20
Replies: 270
Sticky: Lucky 13
Views: 29,974
Posted By philmoore
My mistake, they tested up through 509 and just...

My mistake, they tested up through 509 and just missed the next prime at 521, thanks!
Forum: News 2019-01-08, 22:52
Replies: 270
Sticky: Lucky 13
Views: 29,974
Posted By philmoore
Just a correction: The first to search for...

Just a correction: The first to search for Mersenne primes via computer was not Raphael Robinson in 1952, but rather the team of Max Newman and Alan Turing, using the University of Manchester Mark I...
Forum: News 2019-01-04, 22:06
Replies: 270
Sticky: Lucky 13
Views: 29,974
Posted By philmoore
What's 13 got to do with it?

Can anyone explain to me why this thread is titled "Lucky 13"?

I would also like to point out the significance of the fact that George Woltman and GIMPS have now discovered 1/3 of the known...
Forum: Lounge 2017-02-27, 22:58
Replies: 134
Views: 5,895
Posted By philmoore
I have cut up those eclipse glasses and used duct...

I have cut up those eclipse glasses and used duct tape to cover both lenses of my binoculars to look at the partial/annular eclipse in 2012. It works fine, but you must make absolutely certain that...
Forum: Science & Technology 2017-01-10, 22:11
Replies: 2,824
Views: 165,565
Posted By philmoore
This article contains a chart showing where the...

This article contains a chart showing where the system is in Cygnus:

http://www.skyandtelescope.com/uncategorized/stars-en-route-to-merger/

My telescope mount is low-tech, so I am hoping to...
Forum: Science & Technology 2017-01-07, 19:27
Replies: 2,824
Views: 165,565
Posted By philmoore
Red Nova predicted in Cygnus around 2022

https://www.newscientist.com/article/2110005-double-star-may-light-up-the-sky-as-rare-red-nova-in-six-years/

As a result of a binary star merger, this could shine as as second magnitude star in...
Forum: Lounge 2016-11-23, 00:15
Replies: 35
Views: 5,152
Posted By philmoore
Shouldn't this be split off into a new thread,...

Shouldn't this be split off into a new thread, say, "Good news for Seventeen or Bust"? Nine years since the last discovery, let's hope we don't go that long until the next!

I guess we could now...
Forum: Lounge 2016-03-17, 20:22
Replies: 133
Views: 6,712
Posted By philmoore
I would like to suggest that the Mersenneforum...

I would like to suggest that the Mersenneforum pay for the costs of packaging and postage. I am sure I am not alone in being willing to contribute for this!
Forum: Chess 2016-03-03, 00:21
Replies: 50
Views: 7,131
Posted By philmoore
The pawn is going the other way, so the only...

The pawn is going the other way, so the only question is, what should it be promoted to when it reaches the eighth rank?
Forum: Lounge 2016-02-12, 21:44
Replies: 133
Views: 6,712
Posted By philmoore
ADDRESS VERIFIED: YES MISSING: NONE PACKAGED:...

ADDRESS VERIFIED: YES
MISSING: NONE
PACKAGED: YES
SENT: 17 MAR
RECEIVED: 19 MAR
Forum: Lounge 2016-01-27, 04:13
Replies: 143
Views: 8,736
Posted By philmoore
Brian-E actually guessed 9/15/2015, just two days...

Brian-E actually guessed 9/15/2015, just two days before the actual machine discovery, so I would say both his and MattcAnderson's guesses were remarkably close to what should have been the day had...
Forum: Lounge 2016-01-27, 04:05
Replies: 65
Views: 6,497
Posted By philmoore
M98335147 on 4 December, 2021.

M98335147 on 4 December, 2021.
Forum: News 2016-01-19, 17:44
Replies: 631
Views: 61,044
Posted By philmoore
:party::party::party: Congratulations to us...

:party::party::party:

Congratulations to us all, but especially to George, who now goes down in history as having contributed the most new Mersenne primes percentage-wise: 15 new ones compared to...
Forum: Science & Technology 2015-11-04, 21:31
Replies: 117
Views: 14,095
Posted By philmoore
Here is a link to an article about the Taurid...

Here is a link to an article about the Taurid meteor shower predicting a good year in 2015:

http://star.arm.ac.uk/~dja/taurid/swarmyears.html


Here is a link to a report on the fireball (as...
Forum: Science & Technology 2015-11-04, 17:39
Replies: 117
Views: 14,095
Posted By philmoore
I saw a nice Taurid meteor last night - they...

I saw a nice Taurid meteor last night - they occur every year about this time, but we seem to be encountering a particularly rich part of the stream this year which is producing many fireballs. The...
Forum: Data 2015-09-17, 21:26
Replies: 233
Views: 26,992
Posted By philmoore
Does the author have any benchmarks for this...

Does the author have any benchmarks for this program? How long does it take to LL test a 100 million digit candidate on a system with at least 5 GPUs? The trial factoring code is obviously not very...
Forum: Lone Mersenne Hunters 2015-06-12, 17:41
Replies: 111
Views: 16,861
Posted By philmoore
This is what I thought, too, but Ernst and I did...

This is what I thought, too, but Ernst and I did some calculations a few years back that indicated it was generally worthwhile to spend on the order of 5-6% or so of your total ECM effort on Mersenne...
Forum: MattcAnderson 2015-03-17, 22:16
Replies: 119
Views: 14,871
Posted By philmoore
Could this be a Seventeen or Bust find? Or would...

Could this be a Seventeen or Bust find? Or would the BOINC project not qualify as a PrimeGrid undertaking?
Forum: Puzzles 2015-03-10, 21:43
Replies: 40
Views: 3,560
Posted By philmoore
Maybe he is counting Panama, usually included in...

Maybe he is counting Panama, usually included in "Central America", but there is no reason that the southern part of it could not be considered as part of South America.
Forum: Lone Mersenne Hunters 2015-03-03, 17:16
Replies: 111
Views: 16,861
Posted By philmoore
GB.

GB.
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