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primenumbers · Prime numbers and primality testing

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  • Members: 1089
  • Category: Number Theory
  • Founded: Dec 27, 2000
  • Language: English
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Here is a small puzzle:- Find fixed integers a, b, x, y such that the expression a*x^n+b*y^n is prime for all n in the range 1 <= n <= n_max, where n_max is to...
37 Dec 5, 2009
3:49 pm

djbroadhurst
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Primes in algebraic number systems: Consider the extension to the integers, {A + B * sqrt(d) }, where A, B are variable integers, and d is a fixed integer. (a1...
3 Dec 5, 2009
7:20 am

mikeoakes2
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I've define a set of prime numbers. hypothesis and the Goldbach's conjecture of Riemann that I think would work. a certain number of N, so that, the sum of...
1 Dec 2, 2009
12:59 pm

murat.cagliyan
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And why do you want to absolutely start at n=1? You might instead strat at any n=n_0 >0 value and look for the greater p consecutive n values...
2 Nov 29, 2009
5:55 am

mikeoakes2
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Perhaps someone would enjoy applying some Gaussian concepts to this basic stuff!: Previously, in September, '08 it was conjectured that: x, A(x), B(x), k,...
1 Nov 29, 2009
4:24 am

aldrich617
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http://chitatel2000.blogspot.com/ Update The Number Theory "Number of primes in intervals" "A million dollar problem" [Non-text portions of this message have...
2 Nov 29, 2009
4:20 am

Ali Adams
alipoland
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... (Forwarded) The 'numbertheory&#39; Yahoo group was very well-maintained, had a membership of 1200 and the discussion was of a high level of sophistication. ...
1 Nov 26, 2009
4:09 pm

Kermit Rose
kermit1941
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Congratulations to Henry Lifchitz for finding a record Fibonacci PrP http://www.primenumbers.net/prptop/detailprp.php?rank=5 Lélio [Non-text portions of this...
1 Nov 21, 2009
3:10 am

Lélio Ribeiro de ...
lelio_73
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2b. Re: Composite number function(2) Posted by: "djbroadhurst&quot; d.broadhurst@... djbroadhurst Date: Thu Nov 19, 2009 9:10 pm ((PST)) ... Hello David. ......
1 Nov 20, 2009
3:00 pm

Kermit Rose
kermit1941
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1a. Re: Composite integer function Posted by: "Yann Guidon" whygee@... yasep16 Date: Wed Nov 18, 2009 9:02 am ((PST)) Hello Kermit, it seems that my...
2 Nov 20, 2009
5:10 am

djbroadhurst
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Given any prime expressed as a+b, is there always some a,b such that 2^a*3^b is one away from a prime? I doubt it but have yet to find a counterexample. Below...
3 Nov 20, 2009
4:33 am

marku606
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You might be interested in the following two variable function. Define F(m,k) recursively as follows. F(1,1) = 15 F(m+1,k) = F(m,k) + 4*(2*m + k + 2) F(m,k+1)...
2 Nov 18, 2009
5:02 pm

Yann Guidon
yasep16
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Jens Kruse Andersen's very nice "Primes in Arithmetic Progression Records" page at: http://users.cybercity.dk/~dsl522332/math/aprecords.htm lists "The...
14 Nov 17, 2009
7:50 pm

mikeoakes2
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David, you are absolutely correct, i misstated that conjecture. the conjecture asks whether o_p(2) = p-1 for infinitely many primes. this would correspond to ...
1 Nov 15, 2009
3:17 pm

luis galup
LEGalup
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Greetings all, let o_p(2) = order of 2 in F_p. in other words, o_p(2) = card{ 2^0 (mod p), 2^1 (mod p), ... , 2^p (mod p) } we know that it is an open...
2 Nov 15, 2009
11:49 am

djbroadhurst
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Here are new AP16 & AP17 records at 42 digits:- (263013824+18107251*n)*83#+1 is prime for n=0..16 All confirmed prime with PFGW -tc Input/output statistics:- ...
3 Nov 14, 2009
7:56 pm

Jens Kruse Andersen
jkand71
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I have just submitted to Chris's database a pair of primes that, at 25055 digits, will come in at rank 16 on his Top-20 Twins page ...
1 Nov 14, 2009
6:36 pm

mikeoakes2
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Xeno Riddle An anthropologist and a mathematician strolled through the forest. Suddenly they came upon an extratresterial camp. The two extratresterials,...
2 Nov 14, 2009
2:18 pm

marku606
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While I'm here, I'd like to invite everyone to participate in an online prime search contest. The contest "Tribal Primes" at...
1 Nov 13, 2009
4:41 am

James J Youlton Jr
youjaes
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If one could prove that the residue of mod(P) over all larger primes was equally likely to be 1,2,3...p(n-1), would that in any way prove or be equivalent to...
12 Nov 13, 2009
2:51 am

James J Youlton Jr
youjaes
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Hello, Professor Caldwell. I like your website.  Could you please post the following conjecture: if n>= 2 and F(n)= 2^(2^n)+1, then iff [F(n) mod (2^(n-1)+1)...
6 Nov 12, 2009
4:33 pm

maximilian_hasler
maximilian_h...
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Hi, All. It would be great if I could get some feedback on this. I have completed a third proof of the Riemann Hypothesis, this one being the only one I...
1 Nov 12, 2009
1:38 pm

JeffC
antidyne
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Hi I must test numbers in the form k*2^n+1. Is Pfgw faster than prp.exe? Thank Giovanni Di Maria...
3 Nov 9, 2009
3:08 pm

mgrogue@...
mgrogue
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A Ramanjan Prime Corollary: 2*p_(i-n) > p_i for i > k where k = primepi(p_k) = primepi(R_n). That is, p_k is the n'th Ramanujan Prime, R_n, and the k'th prime....
1 Oct 31, 2009
9:07 pm

reddwarf2956
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One thing I have often thought about is trying to build a quasi-alternating series out of the reciprocals of the primes, so that: - the reciprocal of every...
9 Oct 30, 2009
7:46 pm

djbroadhurst
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Re ... I can easily see that the positive terms would converge. However, there is a problem with showing that the series noted above converges absolutely. Term...
2 Oct 29, 2009
6:34 pm

djbroadhurst
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Is it a known fact that the sum of primes of a twinprime pair is always divisible by 12 ? (divisible by 4 is evident) or is there a counterexample? gr. Rob ...
2 Oct 28, 2009
3:46 pm

marku606
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Hi all, a notion occurred to me that has probably been explored, so I'm looking for references to it. Of the numbers n# +1 or n# -1 (n Primorial plus 1, or...
2 Oct 27, 2009
10:10 pm

maximilian_hasler
maximilian_h...
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"Three smooth" numbers are numbers that have at most factors of two and three. The three smooth numbers up to a thousand are ...
1 Oct 26, 2009
3:30 pm

marku606
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(i) Does the following series converge or diverge? 1/a[1]+1/a[2]+1/a[3]..... Where a[n] is the nth prime in the series of primes p[1],p[2]..that have...
4 Oct 25, 2009
5:19 pm

robert44444uk
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