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I was just looking through my list of "all this persons primes" on the top 5000 primes page. Couldn't believe the smallest one that I ever got on the list 5 years ago this month is now 26,329th on the list. 22467261 · 2333333 - 1 100,351 digits.
Anyone have something smaller than that make the list? |
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Scott Brown Volunteer moderator
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You've got me beat...my smallest:
24985764345 · 2333333 - 1
100,354 digits
24,150 rank
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141941*2^4299438-1 is prime!
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835 · 2^259513 - 1 (78,125 digits)
28,579 = Current Rank
792 = Entrance Rank!
http://primes.utm.edu/primes/page.php?id=69591
This was a good size prime back in '04! |
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rogueVolunteer developer
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How about this one?
http://primes.utm.edu/primes/page.php?id=7845
at a whopping 23225 digits. Added on June 2001 and it survived about 11 weeks. I don't know how NBLB got it added to their project. It was added before their project even existed. I guess I need to talk to Chris Caldwell about it.
I think it is more interesting to have a collection of primes from different projects (or different comments). At the time (back in 2005) I had the largest known Cullen and Woodall primes, found within weeks of one another and both in top 100. The Woodall found in 2007 is not mine, although he did use my software. I should ask Chris to remove my name from it. |
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1065 · 2^464242 + 1
Current rank 17685 (entered at 2180)
Digits: 139754
Found Dec 2008
However my oldest prime is still my biggest... |
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And on the pedestal these words appear:
"My name is Ozymandias, king of kings:
Look on my works, ye Mighty, and despair!"
Nothing beside remains
P B Shelley
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Oh Bondage? Up Yours.
http://www.youtube.com/watch?v=ogypBUCb7DA
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2607*800^2607-1
digits 7572
submitted March 2000
rank 59414
I've been doing this for a long time....
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HonzaVolunteer moderator
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2607*800^2607-1 , digits 7572
I've been doing this for a long time....
Wow, this test would take less than a second...on nowadays CPU.
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My stats
Badge score: 1*1 + 5*1 + 8*3 + 9*11 + 10*1 + 11*1 + 12*3 = 186 |
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 Michael GoetzVolunteer moderator
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2607*800^2607-1 , digits 7572
I've been doing this for a long time....
Wow, this test would take less than a second...on nowadays CPU.
It's not base 2, so it takes a little longer...
cllr.exe -q"2607*800^2607-1" -d
Starting probable prime test of 2607*800^2607-1
Using FFT length 3K, a = 3
2607*800^2607-1, bit: 10000 / 25153 [39.75%]. Time per bit: 0.047 ms.
2607*800^2607-1, bit: 20000 / 25153 [79.51%]. Time per bit: 0.050 ms.
2607*800^2607-1 is base 3-Strong Fermat PRP! Time : 1.214 sec.
Starting Lucas Lehmer Riesel prime test of 2607*800^2607-1
Using FFT length 3K
V1 = 5 ; Computing U0...
2607*800^2607-1, iteration : 10000 / 12118 [82.53%]. Time per iteration : 0.095 ms.
V1 = 5 ; Computing U0...done.
Starting Lucas-Lehmer loop...
2607*800^2607-1, iteration : 10000 / 13035 [76.71%]. Time per iteration : 0.062 ms.
2607*800^2607-1 is prime! Time : 1.689 sec.
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My lucky number is 75898524288+1 |
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HonzaVolunteer moderator
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Wow, this test would take less than a second...on nowadays CPU.
It's not base 2, so it takes a little longer...
Standard LLR 3.8.6 does it on i5-2500 in just 1 secs.
I believe your Win 64-bit 3.8.7 version can squeeze it under 1 sec.
Anyway, PFGW32 and PFGW64 are done 0.66, resp. 0.62 secs.
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My stats
Badge score: 1*1 + 5*1 + 8*3 + 9*11 + 10*1 + 11*1 + 12*3 = 186 |
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Michael GoetzVolunteer moderator
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I'm only running a Q6600. That WAS the 64-bit 3.8.7. ;-)
On a faster CPU I'm sure it could come in under a second.
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My lucky number is 75898524288+1 |
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How about this one?
http://primes.utm.edu/primes/page.php?id=7845
at a whopping 23225 digits. Added on June 2001 and it survived about 11 weeks. I don't know how NBLB got it added to their project. It was added before their project even existed. I guess I need to talk to Chris Caldwell about it.
I think it is more interesting to have a collection of primes from different projects (or different comments). At the time (back in 2005) I had the largest known Cullen and Woodall primes, found within weeks of one another and both in top 100. The Woodall found in 2007 is not mine, although he did use my software. I should ask Chris to remove my name from it.
Ah, yes...I can see how that would be a bit confusing. :-) When NPLB got started in 2008, we actually did so as an extension of the existing PrimeSearch project that previously worked the k=300-1001 range; Gary had talked with Michael Hartley, PrimeSearch's founder, and had received his go-ahead to continue the project, which by then had lapsed into inactivity due to website hosting issues. For the first year or so NPLB actually still used the old "PrimeSearch" code at the top-5000 for all its primes, until Gary got around to emailing Chris Caldwell about updating the project entry to reflect the changes to its organization, at which point the code was renamed to "NPLB". The projects are in fact one and the same, hence the "grandfathering" of prior PrimeSearch primes (of which 50-60 or so remained on the list at the time) into the NPLB label. |
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JohnHonorary cruncher
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The projects are in fact one and the same, hence the "grandfathering" of prior PrimeSearch primes into the NPLB label.
A quick glance of the Prime Pages shows that ~1065 PrimeSearch primes were "grandfathered". Since 2008, when NPLB resumed the search under its new name, ~2327 new primes have been added.
Regardless, the new name still credits the previous project: "No Prime Left Behind (formerly: PrimeSearch)"
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