3.
All other multiples of 3 are not prime.
Prime and odd numbers
There is only one prime number that fits this condition... the number 5 !
To find prime numbers less than 100, the sieve of eratosthenes filters out 1 and all multiples of 2, 3, 5, and 7. All remaining numbers less than 100 are primes.
42 and its next three multiples.
Everything up to and including 20.
The prime numbers that are less than 14 are: 2,3,5,7,11,13.
There are 35 prime numbers less than 150.
Numbers that are prime can't be multiples of 10. Multiples of 10 can't be odd.
4 numbers less than 70 that are multiples of 3 and 5
There are 48 prime numbers less than 220.
There are 27 prime numbers less than 102.
There are 15 prime numbers less than 50