Solutions by Aaron Sherman.

Challenge #1: The first Euclid non-prime

This puzzle afforded me the opportunity to advertize a bit for the
Math::Sequences module by showing how a new entry would be defined.

It otherwise simply prints the solution number uninterestingly.

Challenge #2: Common path prefixes

I thought that this would be a good chance to show off Perl 6's
user-defined operator features including the use of a user-defined
operator in a reduction meta-operator.

The use of the program is simple and can be shown using --help