Problem 252. Project Euler: Problem 16, Sums of Digits of Powers of Two
2^15 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26.
What is the sum of the digits of the number 2^N?
Thanks to Project Euler Problem 16.
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@bmtran (Bryant Tran)
on 4 Feb 2012
added a test case to make it a wee bit harder
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