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Twin primes (view source)

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The smallest twin primes are (3, 5), (5, 7), (11, 13), (17, 19), (29, 31), (41, 43).

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All twin primes except (3, 5) are of the form 6n+/-1.<ref>http://mathworld.wolfram.com/TwinPrimes.html</ref>

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All twin primes except (3, 5) are of the form 6n +/- 1.<ref>http://mathworld.wolfram.com/TwinPrimes.html</ref>

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Proving that there are infinitely many twin primes is one of the great unsolved problems in [[mathematics]].

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