Primespiral

Play into the world of prime numbers!

Primespiral is a function to explore the distribution of prime numbers arranged into a spiral pattern.
The well-known Ulam spiral and the variant developed by Robert Sacks,
the Sacks spiral, show interesting geometric patterns in the positions of primes.
Syntax: primesout=primespiral(t)

Inputs:
t - is an integer number. The spiral will be plotted between 0 and t
If t is omitted, it will be set to 3571 (between 0 and 3571
there are 500 prime numbers).
Outputs:
primesout - the primes of the choosed family, between 0 and t.

The function will ask if you want to use the Ulam, Sacks, Vogel or Archimede spiral.
Then it will ask if you want to highlight a particular prime family.

Outputs:
The primes of the family you choosed between 0 and t

Created by Giuseppe Cardillo
[e-mail]

To cite this file, this would be an appropriate format:
Cardillo G. (2014) Primespiral: Play into the world of prime numbers!
http://www.mathworks.com/matlabcentral/fileexchange/46025