Question 206243
The set of positive integers, that is 
{1, 2, 3, 4 ...}

or

The set of numbers that are 2 times a positive integer, that is 
{2, 4, 6, 8 ...}

or

The set of numbers that are 3 times a positive integer, that is 
{3, 6, 9, 12 ...}

or

The set of numbers that are 4 times a positive integer, that is 
{4, 8, 12, 16 ...}

and so on (will give you an infinite number of infinite sets)