threelonmusketeers@sh.itjust.works to Math Memes@lemmy.blahaj.zoneEnglish · 18 hours agoJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comexternal-linkmessage-square18fedilinkarrow-up191arrow-down13
arrow-up188arrow-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 · 18 hours agomessage-square18fedilink
minus-squareerie09@lemmy.worldlinkfedilinkEnglisharrow-up7arrow-down2·16 hours agoI always felt that 21 should be, but nooo. Stupid 7
minus-squarethreelonmusketeers@sh.itjust.worksOPlinkfedilinkEnglisharrow-up4·edit-211 hours ago 21 should be 2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)
minus-squareBigDanishGuy@sh.itjust.workslinkfedilinkEnglisharrow-up6arrow-down3·11 hours ago9+1 = 10, therefore 91 is divisible by 10 and is not a prime … QED, I guess
I always felt that 21 should be, but nooo. Stupid 7
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