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The first two Fibonacci numbers are equal to 1, and each subsequent equals the sum of the previous two. Draw a spiral: the calculation of the next Fibonacci numbers (Fn) moves Fn steps, each step rotates 90/Fn. see LCMandGCD http://scratch.mit.edu/projects/2922284 prime factorization http://scratch.mit.edu/projects/2900844 perfect numbers http://scratch.mit.edu/projects/2883742 prime numbers http://scratch.mit.edu/projects/2867113 ♥it! ♥it! ♥it! ♥it! ♥it! ♥it!
