Explore Notable Numbers
Discover the stories behind the world's most meaningful numbers.
Math Constants
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π (pi) — 3.141592653589793… The ratio of a circle's circumfe…
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Euler's number e — 2.718281828459045…
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The golden ratio φ — 1.618033988749895…
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√2 — 1.414213562373095… The first known irrational number.
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The Hardy–Ramanujan number: smallest expressible as the sum …
Historic Years
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US Declaration of Independence — 4 July 1776.
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The Moon landing and Woodstock.
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George Orwell's dystopian masterpiece.
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9/11 and Stanley Kubrick's 2001: A Space Odyssey.
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Columbus reaches the Americas.
Computing Classics
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HTTP 404 Not Found — the most recognised error code on the w…
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2¹⁰ — one kibibyte. The fundamental unit of digital storage.
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2³¹ − 1 — the maximum value of a signed 32-bit integer.
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2¹⁶ − 1 — the maximum value of a 16-bit unsigned integer.
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HTTPS port 443 — the foundation of secure web browsing.
Lucky & Cultural
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The fourth prime. Universally considered the luckiest number…
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The Answer to Life, the Universe, and Everything — The Hitch…
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Sacred in Hinduism, Buddhism, and yoga. 108 beads on a mala.
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360 degrees in a circle — the basis of angular measurement.
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The number of days in a year.