2,3,5,7
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The sum of the first four prime numbers is 17.
The first four Mersenne prime numbers are 2, 3, 5, and 7.
The first four prime numbers after 3 are: 5, 7, 11, 13
210 is the number whose prime factors are the first four primes unrepeated.
The first four prime numbers greater than 10 are , 11, 13,17,19 Their mean is (11 + 13 + 17 + 19) / 4 = 15 NB '15' is NOT a prime number.