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Why Friday the 13th is a mathematical inevitability

Summary by Scientific American
No bad luck here—just lots of fascinating math that explains why the 13th of a month so often falls on a Friday

2 Articles

Scientific AmericanScientific American
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Why Friday the 13th is a mathematical inevitability

No bad luck here—just lots of fascinating math that explains why the 13th of a month so often falls on a Friday

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spektrum.despektrum.de

The Fabulous World of Mathematics: Why the 13th Falls More Often on a Friday

Those who are afraid of Friday, the 13th, have bad luck: Friday is especially often the 13th of a month. Mathematics explains why.

·Heidelberg, Germany
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Scientific American broke the news in on Friday, March 13, 2026.
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