List all 3-digit numbers that are equal to the cube of their digits.
1 - 153 370 371 407 Total = 4 [This is the cube of each digit summed up]: 1^3+5^3+3^3 ==153....etc.
2 - 512 Total = 1 [This is the sum of all digits cubed]: 5+1+2==8^3 ==512.
