To err is human, but to really foul things up you need a computer. Paul Ehrlich
An Armstrong Number is a number that is the sum of its own digits each raised to the power of the number of digits
Armstrong numbers are those numbers in which sum of cube of all digits provides the same number.
1^3 = 1
5^3 = 125
3^3 = 27
1^3 + 5^3 + 3^3
= 1 + 125 + 27
153 is an Armstrong Number! 12 is not an Armstrong Number!