47 (number)

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title: "47 (number)" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["integers", "in-jokes"] topic_path: "general/integers" source: "https://en.wikipedia.org/wiki/47_(number)" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::data[format=table title="Infobox number"]

FieldValue
number47
numeralheptaquadragesimal
prime15th
divisor1, 47
::

| number = 47 |numeral=heptaquadragesimal| factorization = prime | prime = 15th | divisor = 1, 47

47 (forty-seven) is the natural number following 46 and preceding 48. It is a prime number.

It is the adopted favorite number of Pomona College, a liberal arts college in Southern California, whose alumni have added cultural references to it in numerous places, including many Star Trek episodes.

Mathematics

47 is a safe prime, a Thabit prime, a regular prime, a cluster prime, an isolated prime, a Ramanujan prime, and a Higgs prime.

47 is also a supersingular prime. It is the last consecutive prime number that divides the order of at least one sporadic group.

In popular culture

Pomona College

::figure[src="https://upload.wikimedia.org/wikipedia/commons/8/8d/Bixby_Plaza_ramp_at_Pomona_College.jpg" caption="The Smith Clock Tower (right) at [[Pomona College]] has been set up to chime on the 47th minute of the hour." alt="Ramp descending toward Bixby Plaza, with the Smith Clock Tower at right"] ::

As an in-joke

Other

Late rapper Capital Steez was infatuated with the number 47 and what it meant spiritually. He believed the number 47 was the "perfect expression of balance in the world", representing the tension between the heart and the brain (the fourth and seventh chakras, respectively.) The number featured on the cover of AmeriKKKan Korruption, stylized to resemble a swastika.

References

References

  1. "Sloane's A005385 : Safe primes". OEIS Foundation.
  2. "Sloane's A055010 : a(0) = 0; for n > 0, a(n) = 3*2^(n-1) - 1". OEIS Foundation.
  3. "Sloane's A007703 : Regular primes". OEIS Foundation.
  4. "Sloane's A038134 : Cluster primes". OEIS Foundation.
  5. {{Cite OEIS. A007510. Single (or isolated or non-twin) primes: Primes p such that neither p-2 nor p+2 is prime.
  6. "Sloane's A104272 : a(n) is the smallest number such that if x >= a(n), then pi(x) - pi(x/2) >= n, where pi(x) is the number of primes <= x". OEIS Foundation.
  7. "Sloane's A007459 : a(n+1) = smallest prime > a(n) such that a(n+1)-1 divides the product (a(1)...a(n))^2". OEIS Foundation.
  8. "Sloane's A002267 : The 15 supersingular primes". OEIS Foundation.
  9. (2006). "Symmetry and the Monster: One of the Greatest Quests of Mathematics". [[Oxford University Press]].
  10. "Capital Steez: King Capital". Rosenberg, Eli.

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