Missouri State University's High School Problem Page
	Barth's Sixth-Degree Surface rendered by Tore Nordstrand

Recall that in the Gregorian calendar there are leap years in years that are divisible by 4 but not 100 and in years divisible by 400. There are 14 possible calendars, 7 for non-leap years (depending on what day January 1 is) and 7 for leap years.

• What is the minimum number of consecutive years it would take to collect all 14 calendars?

• What is the maximum number?

Source: Ivy Fitzgerald

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This page is maintained by Les Reid. Last updated January 8, 2015.