This is part of a guest lecture that legendary mathematician, John Conway, gave at UC Berkley in 2012. I thought it was a goofy aside that could be understoo...
  • threelonmusketeersOPEnglish
    3·
    3 hours ago

    21 should be

    2 + 1 = 3, therefore 21 is divisible by 3 and is not prime. QED :)

    • BigDanishGuyEnglish
      21·
      3 hours ago

      9+1 = 10, therefore 91 is divisible by 10 and is not a prime … QED, I guess