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What is the true meaning of... 47?
In mathematics
Forty-seven is the 15th prime number, a safe prime, the 13th supersingular prime, and the 6th Lucas prime. 47 is a highly cototient number. It is an Eisenstein prime with no imaginary part and real part of the form 3n − 1.
It is also a Keith number, because it recurs in a Fibonacci-like sequence started from its base 10 digits: 4, 7, 11, 18, 29, 47...
47 is a strictly non-palindromic number.
Its representation in binary being 00101111, 47 is a prime Thabit number, and as such is related to the pair of amicable numbers {17296, 18416}.
47 is a Carol number.
In science
* The atomic number of silver
Astronomy
* Messier object M47, a magnitude 4.5 open cluster in the constellation Puppis
* The New General Catalogue object NGC 47,[1] a barred spiral galaxy in the constellation Cetus. This object is also designated as NGC 58.
* The Saros number of the solar eclipse series which began on 1306 BC April 2 and ended on 26 BC May 10.[2] The duration of Saros series 47 was 1280.1 years, and it contained 72 solar eclipses.
* The Saros number of the lunar eclipse series which began on 1275 BC July 31 and ended on 258 February 5.[3] The duration of Saros series 47 was 1537.5 years, and it contained 86 lunar eclipses.
In pop culture
There exists a 47 society,[4] an outgrowth of a movement started at Pomona College, California, USA, which propagates the belief (or, to some, the inside joke) that the number forty-seven occurs in nature with noticeably higher frequency than other natural numbers.[5] The origin of 47 lore at Pomona appears to be a mathematical proof, written in 1964 by Professor Donald Bentley, which supposedly demonstrated that all numbers are equal to 47. However, the proof mentioned above was used by Professor Bentley as a "joke proof" to introduce his students to the concept of mathematical proofs, and is not mathematically valid.[6]
Joe Menosky, who graduated from Pomona College in 1979 and went on to become one of the story writers of Star Trek: The Next Generation, "infected" other Star Trek writers with it, and as a result the number (or its reverse, 74) occurs in some way or other in almost every episode of this program and its spin-offs Star Trek: Deep Space Nine, Star Trek: Voyager and Star Trek: Enterprise. The number might be mentioned in the dialogue, appear on a computer screen a character is looking at, or be a substring of a larger number. The number also appears on some of the DVD menu screens for the episodes. They range from extremely obvious (for example, "shields are down to 47%"), to very well hidden. Some examples are listed here:
* In the TNG episode "Darmok," Worf reports a particle gradient of 4/7.
* In the DS9 episode "Whispers," the planet Parada 4 has seven moons.
* In the Voyager episode "Non Sequitur," Harry Kim lives in apartment 4-G, G being the seventh letter of the alphabet. The intentionality of this reference to 47 was confirmed by Brannon Braga, the writer of that episode.[7]
According to a joke by Rick Berman (the co-creator and executive producer of several Star Trek series), "47 is 42, corrected for inflation".
In various episodes of the television series Alias and Lost the number 47 makes an appearance. In Alias, the number 47 is central to the plot as it had significance in the work of Rambaldi.
The popular video-game series Hitman features a main character known only as Agent 47, a reference to the barcode tattooed on the back of his head.
In the movie Lucky Number Slevin, Nick Fisher's apartment (the one Josh Hartnett sleeps in) is Apartment 47.
In the TV series Scrubs, the number of the apartment JD moves out to from Turk's apartment is also #47.
In manga Claymore, there are 47 warriors in the Organization, as well as the main character being Rank 47
In David Lynch movie Inland Empire, Laura Dern eventually reaches a door with the number 47 on it.
The film National Treasure: Book of Secrets contained a scene which depicts the number 47 on a page that seems to be desired by the president of the United States. The mystery that surrounds this is still unexplained and may be central to the plot of the third movie in the series.
The tale of the 47 Ronin is a historical Japanese story, based upon actual events that took place in year 1701 of the western calendar.
In music
* Black 47, an Irish-American rock band
* In 1998, Japanese electronic musician Takako Minekawa released the album Cloudy Cloud Calculator, which featured a song about the number 47 entitled "Kangaroo Pocket Calculator". The song repeatedly states that "47 is a magical number. 47 plus 2 equals 49. 47 times 2 equals 94. 49 and 94. 94 and 49. Relationship between 47 and 2... is magic" and eventually concludes "Isn't it a coincidence?"
* Leslie Sarony published his song "Forty-Seven Ginger-Headed Sailors" in 1928.[8]
* 47 is the usual number strings of a harp
* 47 is a song by Sunny Day Real Estate
* 47 appears in the lyrics of track number five "Run run run" on The Velvet Underground's "The Velvet Underground & Nico."
* On the front cover of the Koxbox record "The great unknown" you can find the number 47 following three dots in the lower leftside corner.
In sports
47 is:
* The jersey number of NBA star Andrei Kirilenko. His shoes are custom made by Nike and have "AK-47" embroidered on them.
* The jersey number for pitching great Jack Morris.
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