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The longest one can go without seeing a Friday the 13th is 14 months. For a month to have a Friday the 13th, the month must begin on a Sunday. Whenever a common year begins on a Thursday, the months of February, March, and November will have a Friday the 13th. The February-March-November pattern repeats in a 28-year cycle. In 2015, 6 years later, Friday the 13th occurred in February, March, and November.
This won't happen for 11 more years until 2026 and we'll have to wait again for 11 years until 2037 to see the February, March, and November trilogy.
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