threelonmusketeers@sh.itjust.works to Math Memes@lemmy.blahaj.zoneEnglish · 14 hours agoJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comexternal-linkmessage-square17fedilinkarrow-up187arrow-down13
arrow-up184arrow-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 · 14 hours agomessage-square17fedilink
minus-squareerie09@lemmy.worldlinkfedilinkEnglisharrow-up6arrow-down2·12 hours agoI always felt that 21 should be, but nooo. Stupid 7
minus-squarethreelonmusketeers@sh.itjust.worksOPlinkfedilinkEnglisharrow-up3·edit-27 hours ago 21 should be 2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)
minus-squareBigDanishGuy@sh.itjust.workslinkfedilinkEnglisharrow-up4arrow-down1·6 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