threelonmusketeers 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-up188arrow-down13
arrow-up185arrow-down1external-linkJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comthreelonmusketeers to Math Memes@lemmy.blahaj.zoneEnglish • 14 hours agomessage-square17fedilink
minus-square@erie09@lemmy.worldlinkfedilinkEnglish5•12 hours agoI always felt that 21 should be, but nooo. Stupid 7
minus-squarethreelonmusketeersOPlinkfedilinkEnglish4•edit-27 hours ago 21 should be 2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)
minus-square@BigDanishGuy@sh.itjust.workslinkfedilinkEnglish4•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