Driver Code
static public void Main ( ) { long n = 3 ; Console . Write ( n + " th ▁ number ▁ : ▁ " ) ; Console . WriteLine ( center_pentadecagonal_num ( n ) ) ; n = 10 ; Console . Write ( n + " th ▁ number ▁ : ▁ " ) ; Console . WriteLine ( center_pentadecagonal_num ( n ) ) ; } }