Loading ...
Sorry, an error occurred while loading the content.

Corner's of Ulam Spiral

Expand Messages
  • miltbrown@earthlink.net
    The corners of the Ulam Spiral are 4n^2-2n+1 (NE) 4n^2+1 (NW) 4n^2+2n+1 (SW) and 4n^2-4n+2 (SE) [this is always divisible by 2] The first one produces good
    Message 1 of 1 , Jun 2, 2009
    • 0 Attachment
      The corners of the Ulam Spiral are

      4n^2-2n+1 (NE)

      4n^2+1 (NW)

      4n^2+2n+1 (SW) and

      4n^2-4n+2 (SE) [this is always divisible by 2]

      The first one produces good primes, and the line parallel to it

      4n^2-2n-1 produces even more

      11, 29, (55), 89, 131, 181, 239, ...

      Milton L. Brown
      miltbrown@...
    Your message has been successfully submitted and would be delivered to recipients shortly.