47 (number)

47 (forty-seven) is the natural number following 46 and followed by 48.

In mathematics

Forty-seven is the 15^th prime number, a safe prime, a supersingular prime, and the 6^th Lucas prime. 47 is a highly cototient number. It is an Eisenstein prime with no imaginary part and real part of the form <math>3n - 1</math>.

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 101111, 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 April 2 and ended on -26 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 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

Sev Trek's answer to the 47 conspiracy

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. 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.

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.^[5]

According to a joke by Rick Berman (the co-creator and executive producer of several Star Trek series), "47 is 42, corrected for inflation".

The Star Wars franchise references the number in the form of the T-47 Snowspeeders in The Empire Strikes Back (1980), mentioned in dialog by Luke Skywalker.

The number 47 has also been spotted in The Simpsons, Law & Order, NYPD Blue, Threshold, Firefly, Alias, Battlestar Galactica, Lost, Scrubs, South Park, Red Dwarf, and The West Wing.

• The number 47 has appeared in nearly every episode of the TV show Alias, from being a casino's access code, "4747," in "The Coup," to being Milo Rambaldi's favorite number, as he made Page 47 of all his manuscripts the most important.
• In season 4 of Scrubs, the main character, J.D, moves out into his own apartment, whose number is 47.

47 also has been placed in video games in the same deliberate way for almost 20 years. Examples include Earl Weaver Baseball (the batter's uniform number is 47), Hitman (the name of the main character is Agent 47, commonly referred to as simply "47"), Star Wars: Knights of the Old Republic (HK-47), and Half-Life 2: Episode One (starting player health is 47).

In the 2004 film "Man on Fire", the main character needs a PIN for an ATM card. The PIN is 4747. In the English lines, it's consistently read digit by digit (4-7-4-7), though in the Spanish ones, it's read in pairs (47-47).

The number 47 appears on the arm of Magneto in the movie "X-Men: The Last Stand" when he reveals the serial number he received during The Holocaust.

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.^[6]
• 47 is the usual number strings of a harp
• 47 is a song by Sunny Day Real Estate

In sports

47 is:

• The jersey number of former baseball pitching great Jack Morris.
• 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 of former Ohio State great, and current Green Bay Packers linebacker A.J. Hawk.
• The jersey number of Denver Broncos and Tampa Bay Buccaneers safety John Lynch.
• The jersey number of Washington Redskins tight end Chris Cooley.

In other fields

Forty-seven is:

• noted as the number of miracles performed by Jesus listed in the New Testament
• the code for international direct dial phone calls to Norway
• the model number of the Republic P-47 Thunderbolt WWII fighter bomber
• the title of an award-winning novel by Walter Mosley
• In Lucky Number Slevin, Nick Fischer's apartment is number 47.
• Group 47, a literary association in post-World War II Germany
• In the 1976 movie The Omen, the priest that warns Robert Thorn about Damien has 47 crosses nailed to his walls.^[7]
• the number of the French département Lot-et-Garonne
• the number of mountains in "the 47" High Peaks of the Adirondacks
• the number of samurai involved in the famous historical Ako vendetta; sometimes referred to as the 47 Ronin
• the number of bullets that killed Pancho Villa in 1923
• the model number of the AK-47 assault rifle
• "Black '47" is historically considered the worst year of the Irish Potato Famine. * *The phrase inspired the Irish-American rock band of the same name
• The number of the main character "Ray Garraty" in the Stephen King Richard Bachman novel The Long Walk
• The 47th state of the Union is New Mexico
• At age 47, Edward Jenner (1749-1823) pioneered the use of vaccination against smallpox.
• The PBS documentary 'West 47th Street' debuted August 19, 2003
• Los del Rio's 1993 song "Macarena" mentions Macarena 47 times
• The Elvis Presley song "Jailhouse Rock" goes, "Well number 47 said to number 3”

Historical years

A.D. 47, 47 B.C., 1947, 2047, etc.

See also

• 1138
• 4711

References

1. ^ http://www.ngcic.org/
2. ^ http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html
3. ^ http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html
4. ^ http://www.47.net/47society/
5. ^ http://www.schlock.net/letternew.html
6. ^ http://nla.gov.au/nla.mus-vn2278409
7. ^ http://www.dailyscript.com/scripts/Omen.pdf#page=81

External links

• Frequently Asked Questions about 47 and The 47 Society
• Pomona College's Star Trek Connection
• The Mystique of 47 — trivia about the number 47, also part of the Pomona
• [1]The 47gang website
• [http://www.myspace.com/jimmy_47 jimmy47 links to others who love 47
• [http://groups.myspace.com/47society The 47 Myspace Group

College website

• List of 47 References at Memory Alpha — article listing occurrences of the number in episodes and movies of Star Trek, and its context within the plot
• 47 in the Alias fandom (from the All Alias Guide)
• The 47s Community — LiveJournal community to post photos and stories about the number
• Comparative frequency analysis of 42 and 47 against other numbers from Thoreaulylazy's blog

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