3, 7 and 11 are prime numbers.
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no. 3 and 11 are prime numbers. 12 is not a prime number as it can be divided by other things apart from itself and one. these other numbers are 3, 4, 6 and 2.
59. You are adding prime numbers to the previous term: 1+2(1st prime #) = 3 3+3(2nd prime #) = 6 6+5(3rd prime #) = 11 etc...
2, 3, 5, 7, 11, 13.
61 3 2 2 x 3 x 11 = 6
There is 6 prime numbers between 1 and 13, these are 2, 3, 5, 7, 11, 13