Which of the following options is correct ?

1
Any number of the form 6k + 1 or 6k - 1 where k is an positive integer is a prime number.
2
1 is a prime number.
3
A prime number greater than 3 is always of the form 6k + 1 or 6k - 1 where k is an positive integer.
4
The collection of prime numbers and composite numbers is the set of Natural numbers.

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