▲ 1265 ▼ Panik (i.postimg.cc) submitted 2 years ago by ickplant@lemmy.world to c/lemmyshitpost@lemmy.world 146 comments fedilink hide all child comments
[–] match@pawb.social 13 points 2 years ago Quick check for divisibility: subtract 7 from it. If the new number is divisible by 7, then the original number is too permalink fedilink source parent
