threelonmusketeers@sh.itjust.works to Math Memes@lemmy.blahaj.zoneEnglish · 10 days agoJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comexternal-linkmessage-square17fedilinkarrow-up10arrow-down10
arrow-up10arrow-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 · 10 days agomessage-square17fedilink
minus-squareerie09@lemmy.worldlinkfedilinkEnglisharrow-up0·10 days agoI always felt that 21 should be, but nooo. Stupid 7
minus-squarethreelonmusketeers@sh.itjust.worksOPlinkfedilinkEnglisharrow-up0·edit-29 days ago 21 should be 2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)
minus-squareBigDanishGuy@sh.itjust.workslinkfedilinkEnglisharrow-up0·9 days 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