threelonmusketeers to Math [email protected]English • 2 days agoJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comexternal-linkmessage-square21fedilinkarrow-up1105arrow-down13
arrow-up1102arrow-down1external-linkJohn Conway proves that 91 is the smallest number which looks prime but isn'twww.youtube.comthreelonmusketeers to Math [email protected]English • 2 days agomessage-square21fedilink
minus-square@[email protected]linkfedilinkEnglish2•2 days ago9+1 = 10, therefore 91 is divisible by 10 and is not a prime … QED, I guess
9+1 = 10, therefore 91 is divisible by 10 and is not a prime … QED, I guess
In the right base, that might work.