# Problem 119: Digit power sum
The number 512 is interesting because it is equal to the sum of its
digits raised to some power: 5 + 1 + 2 = 8, and 83 = 512. Another
example of a number with this property is 614656 = 284. We shall define
an to be the nth term of this sequence and insist that a number must
contain at least two digits to have a sum. You are given that a2 = 512
and a10 = 614656. Find a30.