26 lines
565 B
Factor
26 lines
565 B
Factor
! Copyright (c) 2007, 2008 Aaron Schaefer.
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! See http://factorcode.org/license.txt for BSD license.
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USING: math.functions project-euler.common sequences ;
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IN: project-euler.016
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! http://projecteuler.net/index.php?section=problems&id=16
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! DESCRIPTION
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! -----------
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! 2^15 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26.
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! What is the sum of the digits of the number 2^1000?
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! SOLUTION
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! --------
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: euler016 ( -- answer )
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2 1000 ^ number>digits sum ;
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! [ euler016 ] 100 ave-time
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! 0 ms ave run time - 0.67 SD (100 trials)
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SOLUTION: euler016
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