There are 22 of them.
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11+13+17+19= 60ANSWER: 60
47 + 3 = 50, 43 + 7 = 50, 37 + 13 = 50, and 31 + 19 = 50. 4 pairs of prime numbers have a sum of 50. 53 + 7 = 60, 47 + 13 = 60, 43 + 17 = 60, 41 + 19 = 60, 37 + 23 = 60, and 31 + 29 = 60. 6 pairs of prime numbers have a sum of 60.
prime numbers are from 1 to 60 = 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59
The numbers are 5 and 12
Assuming leading zeros are not permitted, then: If repeats are not allowed there are 30 possible numbers. If repeats are allowed there are 60 possible numbers.