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Special Numbers

Description

A number is considered special if for N = k/d(k), where d(k) is the number of divisors of k, there are two distinct integer solutions. Similarly, a number is considered very special if both solutions of N = k/d(k) are special numbers as well. 


Question

What numbers in the range 1 ≤ x ≤ 25 are very special numbers? (Put your answers in the form N1,N2,...Nn)


What numbers in the range 1 ≤ x ≤ 25 are very special numbers? (Put your answers in the form N1,N2,...Nn)