Every number has a job
Long before a number is prime or square, it is usually busy with something else: a chemical element, a web error, a phone area code, a food additive, a highway. Here are 1 to 1,000, darker the more real-world jobs each one holds. Hover or tap any number to see them all; 595 of the 1,000 have at least one.
Where each kind of job lives
The same 1 to 1,000, once per domain. Each has its own territory: the periodic table stops at 118, ASCII at 127, and North American area codes never start with 0 or 1.
Atomic numbers 1–118, hydrogen to oganesson. Here: 1–118.
e.g. 79 — On the periodic table, atomic number 79 is Gold (Au) — period 6.
ASCII characters and the code pages that extended them. Here: 1–950.
e.g. 65 — As an ASCII codepoint, 65 is A.
HTTP status codes and well-known network ports. Here: 20–995.
e.g. 404 — HTTP 404 Not Found — The requested resource could not be found.
E-numbers from ingredients labels. Here: 100–968.
e.g. 621 — On an ingredients label, E621 is Monosodium glutamate, a flavour enhancer — MSG, the savoury “umami” enhancer.
North American area codes. Here: 201–989.
e.g. 212 — NANP area code 212 — Manhattan, New York
US Interstates and numbered US routes. Here: 1–101.
e.g. 66 — I-66 — Strasburg, VA to Washington, D.C.
Angles, temperatures, time units, physical constants, latitudes. Here: 7–760.
e.g. 451 — 451 °F is the temperature at which book paper is said to catch fire — the title of Ray Bradbury's dystopian…
Lucky, unlucky and sacred numbers around the world. Here: 3–1000.
e.g. 13 — Western: Triskaidekaphobia — buildings often skip the 13th floor; Friday the 13th is feared.
Type it, turn the calculator upside down, read the word. Here: 14–883.
e.g. 710 — Upside down on a calculator it reads OIL
The busiest numbers
The numbers holding down the most different jobs at once — 100 leads with 6.
- On the periodic table, atomic number 100 is Fermium (Fm) — period 7.
- As an ASCII codepoint, 100 is d.
- HTTP 100 Continue — Server has received the request headers; client should continue with the body.
- On an ingredients label, E100 is Curcumin, a food colour — the yellow of turmeric.
- 100 °C is the boiling point of water at standard sea-level pressure.
- Western: Basis of percentages; "a centenarian" lives 100 years; a perfect score.
- On the periodic table, atomic number 60 is Neodymium (Nd) — period 6.
- As an ASCII codepoint, 60 is <.
- US 60 — Virginia Beach, VA to Brenda, AZ.
- 60th parallel (latitude) — The southern boundary of Yukon, Northwest Territories, and Nunavut; passes through…
- Babylonian: Base of the sexagesimal system — why we have 60 seconds, 60 minutes, and 360°.
- On the periodic table, atomic number 12 is Magnesium (Mg) — period 3.
- As an ASCII codepoint, 12 is FF (form feed).
- I-12 — Baton Rouge to Slidell, LA.
- 12 is the number of months in a year, and the hours marked on a clock face.
- Christian: The twelve apostles; the twelve tribes of Israel.
- On the periodic table, atomic number 30 is Zinc (Zn) — period 4.
- As an ASCII codepoint, 30 is control character (0x1E).
- I-30 — Fort Worth, TX to Little Rock, AR.
- 30th parallel (latitude) — Passes through Egypt, Texas, northern Mexico, and central China — a notable…
- Christian: Thirty pieces of silver — Judas's payment for betraying Jesus.
- On the periodic table, atomic number 14 is Silicon (Si) — period 3.
- As an ASCII codepoint, 14 is control character (0x0E).
- I-14 — Central Texas (Belton to Midway).
- Chinese: Even more unlucky than 4 alone — "certain death."
- Upside down on a calculator it reads hI
- On the periodic table, atomic number 23 is Vanadium (V) — period 4.
- As an ASCII codepoint, 23 is control character (0x17).
- TCP/UDP port 23 is the well-known port for Telnet — Plaintext remote login (deprecated).
- Tropic of Cancer / Capricorn (latitude) — Approximately 23.4° latitude — the Sun is directly overhead at noon…
- Pop culture: The "23 enigma" — Discordian/Illuminati-flavored coincidence-spotting.
- On the periodic table, atomic number 40 is Zirconium (Zr) — period 5.
- As an ASCII codepoint, 40 is (.
- I-40 — Barstow, CA to Wilmington, NC.
- Christian: Recurring number of "a long time" in scripture.
- Upside down on a calculator it reads Oh
- On the periodic table, atomic number 69 is Thulium (Tm) — period 6.
- As an ASCII codepoint, 69 is E.
- TCP/UDP port 69 is the well-known port for TFTP — Trivial File Transfer Protocol.
- I-69 — Multiple segments: Texas border, Indianapolis to Port Huron, MI.
- Pop culture: Juvenile humor — a sexual reference. Stays popular as a meme.
- On the periodic table, atomic number 101 is Mendelevium (Md) — period 7.
- As an ASCII codepoint, 101 is e.
- HTTP 101 Switching Protocols — Server is switching protocols at the client's request (e.g., to WebSocket).
- On an ingredients label, E101 is Riboflavin, a food colour — vitamin B2.
- US 101 — Tumwater, WA to Los Angeles, CA — the Pacific Coast highway.
- On the periodic table, atomic number 4 is Beryllium (Be) — period 2.
- As an ASCII codepoint, 4 is control character (0x04).
- I-4 — Tampa to Daytona Beach across central Florida.
- Chinese: Considered very unlucky — buildings often skip the 4th floor.
- On the periodic table, atomic number 7 is Nitrogen (N) — period 2.
- As an ASCII codepoint, 7 is BEL (bell).
- 7 is the number of days in a week.
- Western: Widely considered lucky — "lucky number seven."
- On the periodic table, atomic number 8 is Oxygen (O) — period 2.
- As an ASCII codepoint, 8 is BS (backspace).
- I-8 — San Diego, CA to Casa Grande, AZ.
- Chinese: Extremely lucky — sought after in addresses, phone numbers, license plates.
Keep exploring
- The Map of Numbers — the same idea for mathematical properties, 1 to 10,000
- HTTP status codes, explained
- Lucky and unlucky numbers