It depends on what the subset is of.
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A whole number is not a set of any kind and so cannot be a subset of rational numbers.
Prime numbers.
You seem to be asking what consecutive numbers are. Consecutive numbers are integers in order, with each one being exactly 1 higher than the previous one. To put it another way, each number is the next higher integer after the previous one. For example, 3, 4, 5, 6, 7 are consecutive numbers. One can also refer to consecutive even numbers, consecutive odd numbers, consecutive square numbers, etc. In each case, each number in the sequence is the next higher number of the specified kind after the previous one. For example, 12, 14, 16, 18 are consecutive even numbers.
kinds of numbers are like 1,2,3,4,5,6,7,8,9,10
even numbers