Project Euler/20

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Project Euler Problem 20 is a problem related to factorial. Find the "digit sum" of the factorial of 100. To learn more about "digit sum", click here.

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Implementations

Aheui

The decimal multiplication algorithm has been improved and now it works for an arbitrarily large number multiplied by any number below a million in any integer base below a million.

밤발발따따빠박따뿌터너벌
ㅇㅇㅇ쑥너벌벌머차바싹볼
희ㅇㅇ뿌터너벌벌서
몽다석차바싼숙머오쎤석러더벌벌썩ㅇㅇ너
ㅇㅇㅇㅇ무선빠사빠싹삭따싼산다빠발발도
ㅇㅇ먀썩뻐ㅇㅇㅇ요

External resources

  • A004152, a related sequence on OEIS. The 101st term is the solution.
  • Problem 20 on Project Euler Official Website (not available)
  • Problem 20 on Project Euler Mirror