.. Created by Adam Cunnningham on Fri June 3 2016.

**Project: Prime Spiral**
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An *Prime Spiral* is produced by writing a rectangular grid of numbers, starting at 1 and spiraling out as follows:

.. image:: prime_spiral.png
   :scale: 50 %

Project Description
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Using the **matplotlib** *plot* function, plot just the points on this grid which correspond to prime numbers (shown in red above).

- Plot a large grid, at least 50 x 50.
- What kinds of patterns can you see in the image?
- Experiment with different marker styles, sizes and colors until you find some that show the patterns best.
- How can these patterns be described mathematically?
- Can you give reasons why any of these patterns might occur?