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Nth number made of prime digits
Easy Accuracy: 64.86% Submissions: 3564 Points: 2

Given a number 'N'. The task is to find the Nth number whose each digit is a prime number i.e 2, 3, 5, 7. In other words you have to find nth number of this sequence : 2, 3, 5, 7, 22, 23 ,.. and so on.

Example 1:

Input:
N = 10
Output: 33
Explanation:10th number in the sequence of
numbers whose each digit is prime is 33.


Example 2:

Input:
N = 21
Output: 222
Explanation:21st number in the sequence of
numbers whose each digit is prime is 222.

Complete primeDigits function and return the nth number of the given sequence made of prime digits.

Constraints:
1 <= N <= 100

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