threelonmusketeers@sh.itjust.works to Math Memes@lemmy.blahaj.zoneEnglish · 1 year agoJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comexternal-linkmessage-square21linkfedilinkarrow-up1113arrow-down13
arrow-up1110arrow-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 · 1 year agomessage-square21linkfedilink
minus-squareerie09linkfedilinkEnglisharrow-up8arrow-down2·1 year agoI always felt that 21 should be, but nooo. Stupid 7
minus-squarethreelonmusketeers@sh.itjust.worksOPlinkfedilinkEnglisharrow-up5·edit-21 year ago 21 should be 2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)
minus-squareBigDanishGuy@sh.itjust.workslinkfedilinkEnglisharrow-up6arrow-down7·1 year ago9+1 = 10, therefore 91 is divisible by 10 and is not a prime … QED, I guess
minus-squarehumorlessrepostlinkfedilinkEnglisharrow-up3·1 year 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.