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The set {1, pi, -3.9} is one such set.
4 belongs to any set that contains it. So {1, pi, 4, -37.5689, sqrt(2)} is a possible answer.
It is a set containing the single number, 3.14, a rational number. This must not be confused with the number pi, which is approximately 3.14 but is an irrational number.
Neative and it's a whole number, I think
It belongs to the interval (25, 27.3), or [-20.9, 10*pi], and infinitely more such intervals.It also belongs to the set of rational numbers, real numbers, complex numbers and quaternions.