Best spiral software for free download

Rhumb Line, original 2-player strategy game of observation and placement on a compass rose board. Officer yellow and Sailor blue stones are placed, one at a time, building and/or blocking point-scoring rhumb line combinations. The object is to out-navigate the opposition and score the most points to rule the waves. 4 same-color stones in a radius is 10 points, an arc 20 points and a spiral 30 points. More than one combination may be scored at a time and points are always accrued, never deducted. The game has music and sound effects.

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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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