Twin prime - Wikipedia
https://en.wikipedia.org/wiki/Twin_primeThe question of whether there exist infinitely many twin primes has been one of the great open questions in number theory for many years. This is the content of the twin prime conjecture, which states that there are infinitely many primes p such that p + 2 is also prime. In 1849, de Polignac made the more general conjecture that for every natural number k, there are infinitely many primes p such that p + 2k is also prime. The case k = 1 of de Polignac's conjectureis the twin prime conj…
An Introduction to The Twin Prime Conjecture
ocw.mit.edu › courses › mathematicsDec 12, 2006 · Twin Prime Conjecture 2 Further research into the conjecture has been concerned with finding expres sions for a form of the prime counting function π(x) that depend on the twin prime constant. The prime counting function is defined as π(x) = {N(p)|p x} where N(p) denotes the number of primes, p. One motivation for defining the