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*** TODO ***
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Technical:
 - Use bigints (maybe GMP or another similar library)
 - Parallelize computations (MPI and/or OpenMP)

Documentation:
 - Write man page
 - Create `help` option

Interface:
 - Option to only print nth number (set default)
 - Option to import numbers from a file (exports with piping)
 - Option to run verbose (print all numbers)