Centered_Decagonal_Number.py

'''
    A centered decagonal number is a centered figurate number that represents
    a decagon with a dot in the center and all other dots surrounding the center
    dot in successive decagonal layers.
    
    The centered decagonal number for n is given by the formula
    5n^2+5n+1 
'''

def centeredDecagonal (num):
    # Using formula
    return 5 * num * num + 5 * num + 1
   
# Driver code 
num = int(input())
print(num, "centered decagonal number :", centeredDecagonal(num)) 

'''
Input:
6
output:
6 centered decagonal number : 211
'''