Turtle graphics based on Matt Henderson's algorithm in Numberphile's "Plotting Pi and Searching for Mona Lisa".
Works only with base 10 (I don't know how to make mpq work with another base).
1/3
1/7
1/13
1/17
1/19
1/21 (not prime)
1/23
1/29
1/31
1/37
1/41
1/43
1/47
1/49 (not prime)
1/51 (not prime)
1/53
1/59 (did I find COVID? I think I did)
1/103
1/113
1/117 (not prime)
