• No, it's not. It's divisible by 3. (and 19)
  • No, it's not a prime number. Don't you know what 3 times 19 is?
    • beaker95
      Is it 42....?
    • Frankie the Fly
      No, that's 3 times 14.
  • 57 has an aliquot sum of 23 and is the first composite member of the 23-aliquot tree. Although 57 is not prime, it is jokingly known as the "Grothendieck prime" after a story in which mathematician Alexander Grothendieck supposedly gave it as an example of a particular prime number.
    • Roaring
      I bet you would have a good explanation of the Golden Mean as well! I noticed your interest in following me. Any reason? Do you have any interesting questions to post?

Copyright 2016, Wired Ivy, LLC

Answerbag | Terms of Service | Privacy Policy