threelonmusketeers@sh.itjust.works to Math Memes@lemmy.blahaj.zoneEnglish · 1 month agoJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comexternal-linkmessage-square19fedilinkarrow-up1106arrow-down12

arrow-up1104arrow-down1external-linkJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comthreelonmusketeers@sh.itjust.works to Math Memes@lemmy.blahaj.zoneEnglish · 1 month agomessage-square19fedilink

minus-squareBigDanishGuy@sh.itjust.workslinkfedilinkEnglisharrow-up6arrow-down5·1 month ago9+1 = 10, therefore 91 is divisible by 10 and is not a prime … QED, I guess

minus-squarehumorlessrepost@lemmy.worldlinkfedilinkEnglisharrow-up2·1 month agoIn the right base, that might work.

9+1 = 10, therefore 91 is divisible by 10 and is not a prime … QED, I guess

In the right base, that might work.