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.
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).
The function will ask if you want to use the Sacks or the Vogel spiral.
Then it will ask if you want to highlight a particular prime family.
The primes of the family you choosed between 0 and t