Power digit sum
AUTHOR
L. Grondin
https://projecteuler.net/problem=16
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 2^1000?
use v6;
say 2**1000 .comb.sum;
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