jump to last post 1-3 of 3 discussions (10 posts)

What this figure presents?

  1. flysky profile image84
    flyskyposted 4 years ago

    What this figure presents?

    https://usercontent1.hubstatic.com/8459540_f260.jpg

  2. john000 profile image97
    john000posted 4 years ago

    Looks like a dog to me. He appears to be sniffing. ?

    1. flysky profile image84
      flyskyposted 4 years agoin reply to this

      Possibly can be, but note the number 1 as a hint...

    2. john000 profile image97
      john000posted 4 years agoin reply to this

      Fibonacci numbers

    3. flysky profile image84
      flyskyposted 4 years agoin reply to this

      ...close :-) So, on the green fields we have numbers: 2,3,5,7,11,13,...

    4. john000 profile image97
      john000posted 4 years agoin reply to this

      Prime #'s. Seems to be a spiral of numbers - so 17,19,23

    5. flysky profile image84
      flyskyposted 4 years agoin reply to this

      Yes! It is the spiral of prime numbers. It was discovered by the mathematician Stanislav Ulam in 1963 so it is called the Ulam spiral. Spiral of a larger size with points representing primes is beautiful.

    6. john000 profile image97
      john000posted 4 years agoin reply to this

      Great puzzle. Thank you.

    7. flysky profile image84
      flyskyposted 4 years agoin reply to this

      ...welcome :-)

  3. flysky profile image84
    flyskyposted 4 years ago

    Hint: Imagine the rest of natural numbers, starting with number 1, on the figure: number 2 is on the square right next to the number 1, number 3 is one square above the number 2, number 4 is left next to the number 3 (i.e. one square above the number 1),... number 6 is down next to the number 5 (i.e. left next to the number 1), etc.

    Which type of numbers fall on green squares?

 
working