31, 37 and 41.
23, 29, 31, 37, 41.
Here's three on either side: 17 19 23 29 31 37
The next four prime numbers greater than 31 are 37, 41, 43, and 47.
30 - 31 = -1
The next three after 23 are: 29 31 37
7, 31, 103 All three are prime numbers and not composite numbers.
23, 29 & 31.
2, 7 AND 31
31 is the only prime factor of 31.
211,141 is not a prime. 31 is a prime.
These are the first prime numbers:2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43... You can find a longer list easily, if you search the Internet for "list of prime numbers".