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primenumbers · Prime numbers and primality testing

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  • Members: 1092
  • Category: Number Theory
  • Founded: Dec 27, 2000
  • Language: English
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After nearly 5 days of 29 computers work I have found a CC15, which sets 15 Simultaneous Primes record: CC15, 2nd kind: 28320350134887132315879689643841 (32...
3 Jun 21, 2008
9:00 pm

Vinícius Botelho
viniciusobot...
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These look like some fun ones to cut ones teeth on, a fair proportion being prime-related (though not really primality-related): ...
3 Jun 21, 2008
12:23 am

Phil Carmody
thefatphil
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I was sent another excellent link by my friend. This is a link to a NEW FREEBIE PAGE for this week so I thought I would, share it with the group...enjoy! The...
1 Jun 19, 2008
9:36 am

heathertillings
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Consider the two arithmetic sequences k d2 + a2 and k + a1 where d2,a2,and a1 are integers, and k is the variable that takes on sequential values 0,1,2,3, ....
1 Jun 15, 2008
1:52 pm

Kermit Rose
kermit1941
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A beautifull day, I have generalized a test for all primes. http://www.devalco.de/helmes_test_2.htm The test checks all numbers below 10^8 and all Carmichael...
1 Jun 14, 2008
11:24 am

Bernhard Helmes
bhelmes_1
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Hi, Group. I have stored the idea for what I call a "disconnected&quot; conclusion for the fact that M(2^127-1) is composite. Just go to yahoo groups and type in...
1 Jun 12, 2008
1:56 pm

leavemsg1
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... Dr. David Broadhurst of Open University U.K, graciously declining the $91.91 prize, has satisfied the requirement with the following contiguous remarks: ...
1 Jun 12, 2008
1:04 am

aldrich617
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Dear Group Members First of all, I can't use English well. So for writing pardon me. We have a paper about prime number and primality. We would like to submit...
1 Jun 10, 2008
6:10 pm

murat.cagliyan@...;LI...
murat.cagliyan
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The sequence of primes have certain characteristic properties. Other sequences of integers have properties in common with the sequence of primes. One family of...
1 Jun 9, 2008
12:23 am

Kermit Rose
kermit1941
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3. Some clarification? Posted by: "chrisdarroch&quot; chrisdarr2@... chrisdarroch Date: Fri Jun 6, 2008 10:23 pm ((PDT)) Just an additional explanation of...
1 Jun 7, 2008
7:50 pm

Kermit Rose
kermit1941
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Just an additional explanation of what I am asking. Consider a value n = 38. Consider values x =[13,17,19,23,29,31,37,41,43,47] which are all indivible(as it...
1 Jun 7, 2008
5:23 am

chrisdarroch
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Chris Caldwell won the initial Prize...but "The contest however will remain open, and I will smash my backup piggybank to replenish the prize, because what I...
1 Jun 7, 2008
4:00 am

aldrich617
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1373, 1523, -1601, -1447...... procedure Ndegrees4; var a : array[0..16] of extended; ct: longint; n,nh ,i,j : integer; ab1,ab2 : extended; begin for i := 0...
1 Jun 7, 2008
3:38 am

aldrich617
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I have found tabulary that a perfect no. -1 or -3 is never a prime. but I can't not find mathmatical solution to that. Another related quesstion is that every...
8 Jun 5, 2008
5:49 pm

Chris Caldwell
primemogul
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Hi all, Would you consider this list A of primes including 2; A = [2,3,5,7,11] Then consider a number n. n has these properties: It is an even integer. It is...
2 Jun 5, 2008
3:27 pm

Bob Gilson
bobgillson
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We apparently have a winner - the eminent Chris Caldwell of UTM. His opus delectus - a hideously beautiful ten page polynomial - is a masterwork of grace and...
4 Jun 5, 2008
3:26 pm

Bob Gilson
bobgillson
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This is a Prime Chain of 147 terms consisting of the output of four equations that alternate sequentially.The equations are either subsequences of x^2 - 79x +...
1 Jun 4, 2008
4:20 pm

aldrich617
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This chain is based on an equation I believe I saw here at the Prime Numbers website last year. 213589,247889,171329,201973,135089,162359,104323,128489,78509, ...
1 Jun 3, 2008
12:36 am

aldrich617
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$91.80 prize Plus Undying Glory to the first person whose equation matches this output: 3167 2753 2753 1979 2357 1277 1979 647 1619 89 1277 397 953 ...
2 May 30, 2008
2:09 am

Chris Caldwell
primemogul
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Come & join this today.. You can get up to usd10000.00 per month.. What are you waiting for? Click here to view video presentation ->...
1 May 29, 2008
7:59 am

Mohd Salleh
nimzo_indy
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I have taken my transform idea that was posted on 5/22 and put it into a programming procedure. The exact mechanism by which it works is a bit of a puzzle....
1 May 29, 2008
2:46 am

aldrich617
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1a. Quadratic Prime Chains Posted by: "aldrich617&quot; aldrich617@... aldrich617 Date: Sun May 25, 2008 6:28 am ((PDT)) Can anyone factor X4 - 97X3 + 3294X2...
1 May 26, 2008
4:33 am

Kermit Rose
kermit1941
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Well, got the official word from D.B.: linear transforms are of no value and egregious factors are annoying. But then again he says that about almost...
2 May 25, 2008
2:49 pm

Paul Underwood
paulunderwooduk
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Some dpfps have the property that both members start with the same prime. Here are same instances: 2^3*19^2*127 2*7^2*13*19^3*181 abundancy 720/361 3^3*5 ...
1 May 24, 2008
4:03 pm

marcus.michel
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A single dpfp is known with the same primes for both members 3^5*11*13^2 3^4*11^3*13 abundancy 6832/3861 Is it possible to find other deficient pairs with the...
1 May 24, 2008
3:13 pm

marcus.michel
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The dpfp with the highest abundancy that I have found is 5^3*7^3*11*13^2*17*43*61^2*67*71*79*97*461^3*1279*106261 ...
1 May 24, 2008
3:10 pm

marcus.michel
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I actually didn't find "bad primes" defined in any number theory way... they were associated with a Calabi-Yau based L-function in a paper with no real good...
1 May 24, 2008
9:38 am

Roger L. Bagula
rlbagulatftn
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(1) [ Definition ] A positive integer p is prime if and only if a > 0 divides p implies a = 1 or a = p. (2) A positive integer p is prime if and only if p...
1 May 24, 2008
3:25 am

Kermit Rose
kermit1941
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In http://www.upforthecount.com/math/mandrill.html, Walter Nissen has defined a primitive friendly pair (pfp): 1. Abundancy is defined as the ratio of the...
1 May 23, 2008
3:33 pm

marcus.michel
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I have found the following AP19 2027663243 + 1002606*19#*n, n=0..18 which, I believe, improves 24 years old "minimal known start AP19" record. The total CPU...
2 May 23, 2008
11:22 am

Jens Kruse Andersen
jkand71
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