threelonmusketeers to Math [email protected]English • 12 hours agoJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comexternal-linkmessage-square18fedilinkarrow-up183arrow-down13
arrow-up180arrow-down1external-linkJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comthreelonmusketeers to Math [email protected]English • 12 hours agomessage-square18fedilink
minus-squarethreelonmusketeersOPlinkfedilinkEnglish3•edit-25 hours ago 21 should be 2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)
minus-square@[email protected]linkfedilinkEnglish3•4 hours ago9+1 = 10, therefore 91 is divisible by 10 and is not a prime … QED, I guess
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