Consecutive is unpredictable (Part 4)

Number Theory Level 4

In decimal representation, find the sum of the first 6 (leftmost) digits of 1000 ! 1000! .

You are only allowed to use:

  • A scientific calculator to calculate the value of 1 0 x 10^x and log ⁡ 10 x \log_{10} x only.


The answer is 24.

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Adam Phúc Nguyễn by Adam Phúc Nguyễn , 20, Vietnam

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1 solution 

1
2
 
import math
print sum(map(int, str(math.factorial(1000))[:6]))

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