What is Twin prime?
A '''twin prime''' is a pair of [[prime number]]s, where one prime is two bigger than the other. The smallest pair of twin primes is 3 and 5. Next comes 5 and 7. Then comes 11 and 13, and then 17 and 19. ==Isolated prime== An '''isolated prime''' is a prime number ''p'' where neither ''p'' - 2 nor ''p'' + 2 is prime. In other words, ''p'' is not part of a twin prime pair. For example, 23 is an isolated prime since 21 and 25 are both not prime numbers. The first few isolated primes are :[[2 (number)|2]], [[23 (number)|23]], [[37 (number)|37]], [[47 (number)|47]], [[53 (number)|53]], [[67 (number)|67]], [[79 (number)|79]], [[83 (number)|83]], [[89 (number)|89]], [[97 (number)|97]], [[113 (number)|113]]… {{math-stub}} [[Category:Classes of prime numbers]]