threelonmusketeers@sh.itjust.works to Math Memes@lemmy.blahaj.zoneEnglish · 3 months agoJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comexternal-linkmessage-square19fedilinkarrow-up143arrow-down11
arrow-up142arrow-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 · 3 months agomessage-square19fedilink
minus-squarethreelonmusketeers@sh.itjust.worksOPlinkfedilinkEnglisharrow-up4·edit-23 months ago 21 should be 2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)
minus-squareBigDanishGuy@sh.itjust.workslinkfedilinkEnglisharrow-up6arrow-down5·3 months ago9+1 = 10, therefore 91 is divisible by 10 and is not a prime … QED, I guess
minus-squarehumorlessrepost@lemmy.worldlinkfedilinkEnglisharrow-up1·3 months agoIn the right base, that might work.
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.