https://projecteuler.net/problem=202
How many rays are there that bounce $n$ times?
https://pypi.org/
https://hub.docker.com/
Dockerfile -> Image -> Container
SageMath Image: https://hub.docker.com/r/sagemath/sagemath
SageMath + Topology Image: https://hub.docker.com/r/computop/sage
https://hub.docker.com/r/nate/dockviz/