There are 94 of them so I guess you will have to work them out - best to use the sieve method.
Chat with our AI personalities
289 is composite. 289 = 17 * 17 = 172
The number after 17 is 18.
15 is a composite number - it can be divided by 3 and 5. 11, 13, 17 and 19 are all prime numbers, not composite.
17 is not a composite number, it is a prime number because it has only two factors itself and one. A composite number has more than two factors.
129 - 112 = 17