threelonmusketeers@sh.itjust.works to Math Memes@lemmy.blahaj.zoneEnglish · 8 days agoJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comvideomessage-square19fedilinkarrow-up1106arrow-down12
arrow-up1104arrow-down1videoJohn 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 · 8 days agomessage-square19fedilink
minus-squareerie09@lemmy.worldlinkfedilinkEnglisharrow-up8arrow-down2·8 days agoI always felt that 21 should be, but nooo. Stupid 7
minus-squarethreelonmusketeers@sh.itjust.worksOPlinkfedilinkEnglisharrow-up4·edit-28 days ago 21 should be 2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)
minus-squareBigDanishGuy@sh.itjust.workslinkfedilinkEnglisharrow-up6arrow-down4·8 days ago9+1 = 10, therefore 91 is divisible by 10 and is not a prime … QED, I guess
minus-squarehumorlessrepost@lemmy.worldlinkfedilinkEnglisharrow-up1·7 days agoIn the right base, that might work.
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
In the right base, that might work.