Find Prime Double Pairs: Frequency & Infinity

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Discussion Overview

The discussion revolves around the occurrence of prime double pairs within sets of consecutive odd numbers, particularly focusing on the frequency of such sequences and whether there are infinitely many of them. The conversation touches on related concepts such as the twin prime conjecture and arithmetic progressions of primes.

Discussion Character

  • Exploratory
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant asserts that in any set of 5 consecutive odd numbers starting from 10, at most 4 can be prime due to the presence of a number ending in 5.
  • Another participant connects the topic to the twin prime conjecture, expressing confidence in the existence of infinitely many twin primes, which may imply the existence of infinite sequences of prime double pairs.
  • A different participant references recent work indicating that there are infinitely many arithmetic series within primes, providing an example related to the sequence of 11, 13, 17, 19.
  • One participant clarifies that the sequence 11, 13, 17, 19 does not constitute an arithmetic progression and discusses the implications of B. Green & Tao's results on long arithmetic progressions of primes, noting that it does not directly address the problem of prime double pairs.
  • Another participant mentions the Hardy-Littlewood conjecture as a relevant framework for understanding the frequency of prime clusters.

Areas of Agreement / Disagreement

Participants express differing views on the implications of existing mathematical results for the problem at hand. There is no consensus on the existence of infinitely many prime double pairs, and the discussion remains unresolved.

Contextual Notes

Some limitations include the dependence on definitions of prime clusters and the unresolved nature of the twin prime conjecture, which may influence the conclusions drawn about the frequency of prime double pairs.

mathman
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Starting at 10, for any set of 5 consecutive odd numbers, at most 4 can be prime (the number ending in 5 cannot be prime). Moreover any such set has to have the number ending in 5 as the middle of two pairs of prime (you cannot have 3 consecutive odd primes when you start after 10). The first example of such a set is 11, 13, 17, 19. The next is 101, 103, 107, 109. How frequently does such a sequence occur? Is it known if there are an infinite number of such pairs of pairs?
 
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mostly related with the twin prime conjecture. If there exists an infinite of twin primes
( I am quite sure there is ) then IT IS possible that there exist an infinite of such sequences. Still an open problem, il try to close it this summer.
 
Recent work has shown there exists an infinite number of arithmetic series within primes.

Using your example of 11, 13, 17, 19. Is the same as 9 + 2n for n = 1, 2, 3, 4. Saying in this sequence that the number of terms is 4, t = 4, the proof shows that there exists in primes arithmetic series of the form a + dn for all t. t = 22 is the largest that has ever been calculated:

11,410,337,850,553 + 4,609,098,694,200n

for n = 1, 2, 3 … 22

However, the twin prime conjecture may be close to being solved, read here: http://mathworld.wolfram.com/news/2004-06-09/twinprimes/

Sorry but I have not heard of your problem before.
 
Hi, 11, 13, 17, 19 isn't quite an arithmetic progression. B. Green & Tao's result, exciting though it is, on arbitrarily long arithmetic progressions of primes won't help here since it 'just' guarantees a progression of primes of the form n+dt for t=1..k for whatever value of k you like but you have no control over d. (it's actually slightly stronger- it guarantees such a progression in any subset of the primes that's dense enough)

Unfortunately I don't know much about mathman's problem apart from the obvious connections to the twin primes conjecture. I can't think of anything right off that would prevent infinitely many such sequences.

edit- http://mathworld.wolfram.com/PrimeConstellation.html gives the Hardy-Littlewood conjecture for the frequency of primes clusters you're looking at.
 
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