In Exercises 1322, show that the set has cardinal number 0 by establishing a one-to-one correspondence

In Exercises 13–22, show that the set has cardinal number ℵ₀ by establishing a one-to-one correspondence between the set of counting numbers and the given set. Be sure to show the pairing of the general terms in the sets.

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{3, 6, 9, 12, 15, ...}