There must exist at least two prime numbers. If 2 is the first prime number, then 3 must also be a prime because no two consecutive integers have the same prime factorization. If 2 and 3 were the only prime numbers then the rest of the integers would be either the power of 2 or 3. The set of positive integers would appear like
S = {2, 3, 2*2, 3*3, 2*2*2, 3*3*3,….}.
The mapping f: S –> N would imply
2 = 2, 3 =3, 2*2 = 4, 3*3 = 5, 2*2*2 = 6, 3*3*3 = 7, etc.
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