How do you handle OutOfMemoryError?

[Enjoys Math via Digitalmars-d-learn]

Here's my code:

https://drive.google.com/file/d/0B3LYxKGJ4ZI_MV91SkxPVVlSOW8/view?usp=sharing

I don't have access to a debugger.

Run the code for a few minutes and it tends to crash with a core 
OutOfMemoryError.

Any suggestions welcome including regularly cleaning up memory 
used.

Thanks.