They are 11, 13, 17 and 19
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They are: 11, 13, 17 and 19
11
Two prime numbers which are : 7 , 11 Note: both 5 & 13 are also prime numbers but they are not included in this question.
3, 7 and 11 are prime numbers.
Just the one: 11 itself. If any other number were divisible by 11 that number would not be a prime.