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As a result, the sum of any pair of twin primes other than 3 and 5 is divisible by 12 For example, 23 is an isolated prime, since 21 and 25 are both
There are 808,675,888,577,436 twin prime pairs below 10 18 The first few twin prime pairs are: 3, 5 , 5, 7 , 11, 13 , 17, 19 , 29, 31 , 41, 43 , 59, 61 , 71, 73 , 101, 103 , 107, 109 , 137, 139 , …

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of 58711-digit twin prime record• 2014 , "Variants of the Selberg sieve, and bounded intervals containing many primes", Research in the Mathematical Sciences 1: Art.

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Five is the only prime in two distinct pairs
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The first few isolated primes are , , , , , , , , , ,
أختر الإجابة الصحيحة العددان هما توأم أولي
; Motohashi, Yoichi; ; 2006 , "", Japan Academy
Heini Halberstam, and Hans-Egon Richert, Sieve Methods, p Twin primes become increasingly rare as one examines larger ranges, in keeping with the general tendency of gaps between adjacent primes to become larger as the numbers themselves get larger
; ; 2009 , "Small gaps between primes or almost primes", Transactions of the American Mathematical Society 361 10 : 5285—5330, :• 3 as x tends to infinity

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The limiting value of f x is conjectured to equal twice the twin prime constant not to be confused with , according to the Hardy—Littlewood conjecture.

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The work of in 2013, as well as work by , and others, has made substantial progress towards proving that there are infinitely many twin primes, but at present this remains unsolved
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San Diego, CA: Academic Press
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This famous result, called , was the first use of the and helped initiate the development of modern