Boom numbers are numbers consisting only of digits 2 and 3. Given an integer K, display the K-th Boom number.
K = 5
The Boom series is 2, 3, 22, 23, 32, 33, 222....
and, for K=5, answer = 32
K = 100
You don't need to read input or print anything. Your task is to complete the function BoomNumber() which takes an interger Kas input parameter and returns the Kth boom number in the form of a string.