47 (number)#References to 47
{{Infobox number
| number = 47
| 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,{{Cite web|url=https://oeis.org/A005385|title=Sloane's A005385 : Safe primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-30}} a Thabit prime,{{Cite web |title=Sloane's A055010 : a(0) = 0; for n > 0, a(n) = 3*2^(n-1) - 1 |url=https://oeis.org/A055010 |website=The On-Line Encyclopedia of Integer Sequences |publisher=OEIS Foundation}} a regular prime,{{Cite web |title=Sloane's A007703 : Regular primes |url=https://oeis.org/A007703 |website=The On-Line Encyclopedia of Integer Sequences |publisher=OEIS Foundation}} a cluster prime,{{Cite web |title=Sloane's A038134 : Cluster primes |url=https://oeis.org/A038134 |website=The On-Line Encyclopedia of Integer Sequences |publisher=OEIS Foundation}} an isolated prime,{{Cite OEIS |A007510 |Single (or isolated or non-twin) primes: Primes p such that neither p-2 nor p+2 is prime. |access-date=2024-06-19 }} a Ramanujan prime,{{Cite web |title=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 |url=https://oeis.org/A104272 |website=The On-Line Encyclopedia of Integer Sequences |publisher=OEIS Foundation}} and a Higgs prime.{{Cite web |title=Sloane's A007459 : a(n+1) = smallest prime > a(n) such that a(n+1)-1 divides the product (a(1)...a(n))^2 |url=https://oeis.org/A007459 |website=The On-Line Encyclopedia of Integer Sequences |publisher=OEIS Foundation}}
47 is also a supersingular prime.{{Cite web|url=https://oeis.org/A002267|title=Sloane's A002267 : The 15 supersingular primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-30}} It is the last consecutive prime number that divides the order of at least one sporadic group.{{Cite book |last1=Ronan |first1=Mark |author-link=Mark Ronan | title=Symmetry and the Monster: One of the Greatest Quests of Mathematics |url=https://archive.org/details/symmetrymonstero0000rona |url-access=registration |publisher=Oxford University Press |location=New York |year=2006 |pages=244–246 |isbn=978-0-19-280722-9 |oclc=180766312 |mr=2215662 |zbl=1113.00002 }}
In popular culture
=Pomona College=
File:Bixby Plaza ramp at Pomona College.jpg has been set up to chime on the 47th minute of the hour.]]
{{anchor|As an in-joke}}
{{Excerpt|Traditions of Pomona College|47 reverence|hat=no}}
=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.{{Cite web|url=https://www.thefader.com/2013/11/26/capital-steez-king-capital|title=Capital Steez: King Capital|website=The Fader|publisher=Rosenberg, Eli|access-date=2016-08-30}}