The set of prime numbers less than 20 = {2, 3, 5, 7, 11, 13, 17,19}
20 and 40
There are actually 8 prime numbers less than 20: 2, 3, 5, 7, 11, 13, 17, and 19
2 5 6
Three of them.
9 and 15 are the only two odd composite numbers less than twenty.
23 and 29
The numbers 1, 2, 3, ... , 18, 19.
2 and 4
The prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17, and 19.
2 1
The only prime numbers with squares less than 20 are 2 and 3 Numbers containing 2 squared : 4, 8, 12, 16 Numbers containing 3 squared : 9, 18
2 and 5 the difference is 3 which is a prime number
10, 20, and 30 all have factors of 2 and 5
2 3 5 7 11 13 17 19.
2 3 5 7 11 13 17 19.
No, there are eight: 2 3 5 7 11 13 17 and 19.