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Math-types have previously noted the oddity not only of cicadas emerging in buzz-resounding throngs every 13 or 17 years (depending on species), but the fact that those are PRIME numbers! Old article on these prime-number outbreaks, including a proposed explanation offered by the late, great Stephen Jay Gould here:

http://www.baltimoresun.com/features/bal-te.ms.cicada10may10,0,799114.story

...and another piece on the subject:

http://www.wired.com/wiredscience/2009/05/primecicadas/

Amazing cicada video from the amazing David Attenborough on YouTube here:
http://www.youtube.com/watch?v=tjLiWy2nT7U