Common year starting on Friday has only one Friday the 13th; The only Friday the 13th in this common year occurs in August. Leap years starting on Thursday share this characteristic, but also have another one in February. This is the only year type where the "n"th "Doomsday" (this year Sunday) is not in ISO week "n"; it is in ISO week "n"-1. In the (currently used) Gregorian calendar, the fourteen types of year (seven common, seven leap) repeat in a 400-year cycle (20871 weeks). Forty-three common years per cycle or exactly 10.75% start on a Friday. The 28-year sub-cycle does only span across century
Friday the 13th (franchise) the 11 films", not including interviews with other film professionals like Wes Craven. Grove's book also includes previously unseen production photos which were acquired from private collections. Eight months after the release of Grove's book, Titan Books, in association with Sparkplug Press, released a detailed history on the "Friday the 13th" series. Peter M. Bracke released "Crystal Lake Memories: The Complete History of Friday the 13th" on October 24, 2005. The book chronicles the creation of the series up to the release of "Freddy vs. Jason". Bracke spent three years researching the series and collecting more than 200 interviews from