threelonmusketeers to Math Memes@lemmy.blahaj.zoneEnglish • 4 months agoJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comexternal-linkmessage-square21fedilinkarrow-up1112arrow-down13
arrow-up1109arrow-down1external-linkJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comthreelonmusketeers to Math Memes@lemmy.blahaj.zoneEnglish • 4 months agomessage-square21fedilink
minus-squarethreelonmusketeersOPlinkfedilinkEnglish5•edit-24 months ago 21 should be 2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)
minus-square@BigDanishGuy@sh.itjust.workslinkfedilinkEnglish-1•4 months ago9+1 = 10, therefore 91 is divisible by 10 and is not a prime … QED, I guess
2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)
9+1 = 10, therefore 91 is divisible by 10 and is not a prime … QED, I guess
In the right base, that might work.