[support] permalink format

[Joe Corneli]

Dear Drupalistas:

Recently, we launched a Drupal-based system on planetmath.org.

The system serves MathML-enhanced HTML5 that is generated from LaTeX
sources.  At the moment, our LaTeX converter produces links like
http://planetmath.org/node/38977 -- Can you recommended a way to get
Drupal to serve this content using the nicer permalink format
http://planetmath.org/planetmath?

Joe