number.wiki

number.wiki

A wiki of numbers. Properties, factorizations, sequences, and curated context for every notable integer — currently 11,382 pages and growing.

Any non-negative integer works. Notable numbers get a permanent page; others show a live analysis.

Try /42, /1729, or /2026.

Popular tags

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Curated 28 Prime 9,594 Fibonacci 18 Perfect Number 3 Palindrome 203 Happy Number 1,718 Power of Two 12 Carmichael Number 3

From the wiki

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HTTP status codes: the numbers behind the web
What 200, 301, 404, 418, and 500 actually mean — a plain-English guide to the three-digit numbers web servers send back every time you click a link.
Jul 7, 2026
Why a circle has 360 degrees
Why we split a circle into 360°, an hour into 60 minutes, and a day into 24 hours — the ancient base-60 counting that still runs the clock and the compass.
Jul 5, 2026
The history of zero
How nothing became a number: a Babylonian placeholder, a Mayan shell, and finally an Indian number with its own arithmetic.
Jul 3, 2026

Featured

0
0 — Zero
1
1 — One
2
2 — The Only Even Prime
3
3 — Three
7
7 — Seven
13
13 — Thirteen
17
17 — Seventeen
23
23 — Twenty-Three
42
42 — The Answer to Life, the Universe, and Everything
60
60 — Sexagesimal Base
67
67 — “Six-seven”
69
69 — Sixty-Nine