There are two : 5 and 7.
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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