Armstrong Number

The number which is equal to the sum of cubes of each of its digits  is called Armstrong Number.

Let  ABC be a 3 digit number where A,B,C  are digits of the number.

If A³+B³+C³ = ABC, then we say ABC  is an Armstrong Number.

Generally, 
let A₁A₂A₃.....A_n  is a n-digit  number where A₁, A₂, A₃, ....., A_n are digits of the number.

This is an Armstrong Number if

A₁A₂A₃.....A_n =  A₁³ + A₂³ + A₃³+......+ A_n³

Example:- 0, 1, 153, 370, 371,407,1634.....

153 = 1³+5³+3³

370 = 3³+7³+0³

1634 = 1³+6³+3³+4³

                                     

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