11, 31, 41
1, 11, 21, 31, 41. 1 is not a prime number.
A single digit prime number
The list of prime numbers less than or equal to seven:2, 3, 5, 7
2,3,5,7,11,13,17,19
2, 3, 5, and 7 are prime numbers for one digit numbers. 1 is NOT a prime number.
1, 11, 21, 31, 41. 1 is not a prime number.
A single digit prime number
The ones digit in the product from multiplying the 305 prime numbers less than 2012 is 0 because the ones digit becomes 0 after 2 and 5 have been multiplied and remains unchanged after more prime numbers are multiplied.
11,31,41
The list of prime numbers less than or equal to seven:2, 3, 5, 7
17
2,3,5,7,11,13,17,19
2, 3, 5, and 7 are prime numbers for one digit numbers. 1 is NOT a prime number.
31 and 41.
All the prime numbers less than 20 are 2,3,5,7,11,13,17,19
Search the Internet for a list of prime numbers - the Wikipedia article on prime numbers might list a few. All numbers between 2-100 that are not prime, are composite. (The number is not counted as prime, nor as composite.)
101 103 107 109.