# 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.

*This article is a stub, which means that it is not detailed enough and needs to be expanded. Please help us by adding some more information.*

## 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