themaninblack@lemmy.world to memes@lemmy.world · 4 months agoMath(s)lemmy.worldexternal-linkmessage-square43linkfedilinkarrow-up1584arrow-down129
arrow-up1555arrow-down1external-linkMath(s)lemmy.worldthemaninblack@lemmy.world to memes@lemmy.world · 4 months agomessage-square43linkfedilink
minus-squareiknowitwheniseeit@lemmynsfw.comlinkfedilinkarrow-up3·4 months agoWhy? 19 is 15+4 but is still prime?
minus-squareVerito@lemm.eelinkfedilinkarrow-up4·4 months agoBecause 30 and 21 are both divisible by the same number, 3.
Why? 19 is 15+4 but is still prime?
Because 30 and 21 are both divisible by the same number, 3.
Exactly 3(10+7)