Twin Prime

A twin prime is a prime number that differs from another prime number by two, for example the twin prime pair (41, 43). Sometimes the term twin prime is used for a pair of twin primes; an alternative name for this is prime twin or prime pair.

List of unsolved problems in mathematics
Are there infinitely many twin primes?

Read more about Twin Prime:  History, Brun's Theorem, Largest Known Twin Prime Pair, Properties, First Hardy–Littlewood Conjecture, Polignac's Conjecture, Isolated Prime

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