There are two : 5 and 7.
2 3 5 7 11 13
2, 3, 5, and 7; also, if it is 1 to 11 inclusive, the list should include 11 because it is a prime number.
231 is NOT a prime number. It is divisible by 3, 7 and 11.
33 is not a prime number because 3 x 11 = 33.
'9' is NOT a prime number, because is is a compound of 3 x 3 = 9
11 is a prime number but 21 is not a prime number as it is divisible by 3.
2 3 5 7 11 13
2, 3, 5, and 7; also, if it is 1 to 11 inclusive, the list should include 11 because it is a prime number.
It is: 2*3*5*7*11 = 2310 inclusive or 3*5*7 = 105
231 is NOT a prime number. It is divisible by 3, 7 and 11.
33 is not a prime number because 3 x 11 = 33.
13 is prime so it is not the number. 15 is the product of 3 and 5, two prime numbers, so it fits the conditions. 17 is prime so it is not the number. 19 is prime so it is not the number. 15 is the only odd number between 11 and 21 that fits the conditions. However, if 21 is included in the range, it also is the product of two prime numbers: 3 x 7.
The prime numbers in the range 1-14 are 2, 3, 5, 7, 11 and 13.
759 is not prime. 759 = 3 * 11 * 23
1, 2, 3, 5, 7, 11 Edited answer: 2+3+5+7 = 17 2+3+5+7+11 = 28 (inclusive of 11) Note that 1 is not a prime number.
'9' is NOT a prime number, because is is a compound of 3 x 3 = 9
The prime factors of 99 are 3 * 3 * 11.