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Prime Number Spiral
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Version
6.67
The Prime Number Spiral (a.k.a. the Ulam Spiral) is
constructed as follows: Consider a rectangular grid. We
start with the central point and arrange the positive
integers in a spiral fashion (anticlockwise). The prime
numbers are then marked. There is a tendency for the
prime numbers to occur on diagonal lines, however far
out into the spiral one goes. This is software is for
exploring the Prime Number Spiral. It also (a) allows
coloring of the prime numbers in various ways, (b)
displays a random arrangement to compare with the
primes and (c) shows how square and triangular numbers
are located on the spiral.
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