File:41 and more Ulam's Spiral - Numberphile

Description
More on prime numbers and Ulam's Spiral - this time focusing on 41 and Arthur C. Clarke.

This video features Dr James Clewett. More Clewett videos at: http://bit.ly/JamesClewett

See our other Ulam Spiral video at: http://youtu.be/iFuR97YcSLM And more to come soon...

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Videos by Brady Haran A run-down of Brady's channels: http://bit.ly/bradychannels

The book discussed is The Garden of Rama.