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

Re: [PrimeNumbers] Additive prime fun with 2,3 and 5.

Expand Messages
  • Phil Carmody
    ... 2^5 = 32. ITYM All their _odd_ additive combinations. Phil
    Message 1 of 3 , Nov 12, 2008
    • 0 Attachment
      --- On Thu, 11/13/08, Mark Underwood <mark.underwood@...> wrote:
      > The five numbers 3, 2*3^2, 2^2*3*5, 2^2*3^3 and 2^3*5^2
      > (3,18,60,108 and 200)
      > have all 16 of their additive combinations prime:
      > 11 17 47 53 131 137 167 173 227
      > 233 263 269 347 353 383 389.

      2^5 = 32. ITYM All their _odd_ additive combinations.

      Phil
    • Mark Underwood
      ... Yes there would indeed be 32 additive combinations with five numbers, but half of these would just be the negatives of the other half, so I go with 16. In
      Message 2 of 3 , Nov 13, 2008
      • 0 Attachment
        --- In primenumbers@yahoogroups.com, Phil Carmody <thefatphil@...> wrote:
        >
        > --- On Thu, 11/13/08, Mark Underwood <mark.underwood@...> wrote:
        > > The five numbers 3, 2*3^2, 2^2*3*5, 2^2*3^3 and 2^3*5^2
        > > (3,18,60,108 and 200)
        > > have all 16 of their additive combinations prime:
        > > 11 17 47 53 131 137 167 173 227
        > > 233 263 269 347 353 383 389.
        >
        > 2^5 = 32. ITYM All their _odd_ additive combinations.
        >

        Yes there would indeed be 32 additive combinations with five numbers, but half of these
        would just be the negatives of the other half, so I go with 16. In this case, I keep the 200
        positive, and the other four: 3,18,60 and 108 go positive and negative.

        Mark
      Your message has been successfully submitted and would be delivered to recipients shortly.