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The prime factors of 366 are 2, 3, and 61. You'll need them, too :).

The first rule of pentamester club is: we do not talk about February 29th ;)

or you can have a day of break every four years :(

Or you can observe 1461 = 3 * 487 and divide every four-year period into... um... three hexadecamesters?

That's the spirit!

Don't forget, every 100 years isn't a leap year, but every 400 is.

Their are 485 leap years between 2000 and 3999, inclusive, for a total of 730,120 days.