5^2 = 25
(5 - 1)! + 1 = 4! + 1 = 24 + 1 = 25
25 divides 25 and so 5 is a Wilson prime.
13^2 = 169
(13 - 1)! + 1 = 12! + 1 = 479001600 + 1 = 479001601
169 divides 479001601 (= 2834329) so 13 is a Wilson prime.
Chat with our AI personalities
there are 13 primes not 5.
2 x 2 x 5 x 13
There are for pairs of co-primes between 1 and 25. They are (3, 5), (5, 7), (11, 13), and(17, 19).
Well, to begin with, 2 and 3 are not twin primes. The first twin primes are 3 and 5, but then 5 and 7 are also twin primes. After that, it's 11 and 13, then 17 and 19, 29 and 31, and 41 and 43. Twin primes are distinguished by having a difference of 2 between them.
17, it's the sequence of primes.