@skytomo221: aliens “we use decimal numbers” Earthling: “Oh, he’s with us.” Alien: “By the way, to determine if a number is a multiple of 7, just make sure the sum of all digits is a multiple of 7, right?” Earthling: “Isn’t that how you determine multiples of 3 and 9?” Alien: “I see, it seems you are not with us.”
SF Settings
This page is auto-translated from /nishio/10進数 using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I’m very happy to spread my thought to non-Japanese readers.