7, 31, 103
All three are prime numbers and not composite numbers.
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The they are.
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31 are prime numbers. they are not composite numbers.
Composite because '7' is a factor of 1519 7)1519 = 217 Divide by '7' again 7)217 = 31 Divide by '31' ( a prime Number) / 31 = 1 So 1519 is a composite of 7 x 7 x 31 or 49 x 31
None of the numbers 7, 11, and 13 are composite numbers; they are all primes.
5 and 7 are both prime numbers.