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In spoken English, the numbers 17 and 70 are sometimes confused because they sound similar. When carefully enunciated, they differ in which syllable is stressed: 17 // vs 70 //. However, in dates such as 1789 or when contrasting numbers in the teens, such as 16, 17, 18, the stress shifts to the first syllable: 17 //.
In mathematics 
Seventeen is the 7th prime number. The next prime is nineteen, with which it forms a twin prime. 17 is the sum of the first four primes. 17 is the sixth Mersenne prime exponent, yielding 131071. 17 is an Eisenstein prime with no imaginary part and real part of the form 3n − 1.
17 is the third Fermat prime, as it is of the form 24 + 1, and it is also a Proth prime. Since 17 is a Fermat prime, regular heptadecagons can be constructed with compass and unmarked ruler. This was proven by Carl Friedrich Gauss. Another consequence of 17 being a Fermat prime is that it is not a Higgs prime for squares or cubes; in fact, it is the smallest prime not to be a Higgs prime for squares, and the smallest not to be a Higgs prime for cubes.
17 is the thirteenth term of the Euclid–Mullin sequence.
There are exactly seventeen two-dimensional space (plane symmetry) groups. These are sometimes called wallpaper groups, as they represent the seventeen possible symmetry types that can be used for wallpaper.
In the Irregularity of distributions problem, consider a sequence of real numbers between 0 and 1 such that the first two lie in different halves of this interval, the first three in different thirds, and so forth. The maximum possible length of such a sequence is 17 (Berlekamp & Graham, 1970, example 63).
Either 16 or 18 unit squares can be formed into rectangles with perimeter equal to the area; and there are no other natural numbers with this property. The Platonists regarded this as a sign of their peculiar propriety; and Plutarch notes it when writing that the Pythagoreans "utterly abominate" 17, which "bars them off from each other and disjoins them".
17 is the tenth Perrin number, preceded in the sequence by 7, 10, 12.
In base 9, the smallest prime with a composite sum of digits is 17.
17 is known as the Feller number, after the famous mathematician William Feller who taught at Princeton University for many years. Feller would say, when discussing an unsolved mathematical problem, that if it could be proved for the case n = 17 then it could be proved for all positive integers n. He would also say in lectures, "Let's try this for an arbitrary value of n, say n = 17."
Similar to Feller, Prof. Vadim Khayms of Stanford University is also known to use 17 as an arbitrary value during lectures. His Computational Mathematics for Engineers course includes 17 lectures.
17 is the first number that can be written as the sum of a positive cube and a positive square in two different ways; that is, the smallest n such that x3 + y2 = n has two different solutions for x and y positive integers. The next such number is 65.
17 is the minimum number of vertices on a graph such that, if the edges are coloured with 3 different colours, there is bound to be a monochromatic triangle. (See Ramsey's Theorem.)
In science 
- The atomic number of chlorine.
- The Brodmann area defining the primary visual processing area of mammalian brains.
- Group 17 of the periodic table is called the halogens.
Age 17 
- In the United Kingdom, the minimum driving age for a car or van.
- In the United States, it is the age at which one may purchase, rent, or reserve M-rated video games without parental consent.
- Also, in some of the states in the United States, and some jurisdictions around the world, seventeen is the age of sexual consent.
- In most states of the United States, Canada and in the United Kingdom, the age at which you may donate blood (without parental consent).
- In many countries and regions, the age at which one may obtain a driver's license.
- In the United States, the age at which one may watch, rent, or purchase R-rated movies without parental consent.
- In the United States, the age at which one can enlist in the armed forces with parental permission.
- At this age one can apply for a Private Pilot Licence (however the applicant can start training at 16).
In culture 
- 17 Hippies, a German band
- Sytten (17 in Norwegian), a Norwegian-American rapper
- 17 (Motel album)
- 17 (Ricky Martin album)
- Chicago 17, a 1984 album by Chicago
- Seventeen Days, a 2005 album by 3 Doors Down
- Seventeen Seconds, a 1980 album by The Cure
- "17" (Sky Ferreira song)
- "17" (Yourcodenameis:Milo song)
- "17 Again", a song by Eurythmics
- "17 år", a song by Veronica Maggio
- "17 Days", a song by Prince
- "Seventeen" (Jet song)
- "Seventeen" (Ladytron song)
- "Seventeen" (Winger song)
- "Seventeen Forever", a song by Metro Station
- "At Seventeen", a song by Janis Ian
- "Edge of Seventeen", a song by Stevie Nicks
- "17", a song by Dan Bălan
- "17", a song by Jethro Tull
- "17", a song by Kings of Leon
- "17", a song by Milburn
- "17", a song by Rick James from Reflections
- "17", a B-side by Shiina Ringo on the "Tsumi to Batsu" single
- "17", a song by The Smashing Pumpkins from the album Adore
- "17", a song by Youth Lagoon from the album The Year of Hibernation
- "Only 17", a song by Rucka Rucka Ali
- "(She's) Sexy + 17", a song by Stray Cats from Rant N' Rave with the Stray Cats
- "Seventeen", a song by ¡Forward, Russia! from Give Me a Wall
- "Seventeen", a song by Jimmy Eat World from Static Prevails
- "Seventeen", a song by Marina & the Diamonds from the US edition of The Family Jewels
- "Seventeen", a song by Mat Kearney from the iTunes edition of Young Love
- "Seventeen", a song from the Repo! The Genetic Opera soundtrack
- "Seventeen", the original title of the song "I Saw Her Standing There" by The Beatles
- "Seventeen Ain't So Sweet", a song by The Red Jumpsuit Apparatus from Don't You Fake It
- "Hello, Seventeen", a song by 12012
- Number 17 (1928 film), a British-German film
- Number Seventeen (1932), directed by Alfred Hitchcock
- Number 17 (1949 film), a Swedish film
- Stalag 17 (1953), directed by Billy Wilder
- Try Seventeen (2002), directed by Jeffrey Porter
- In 2004, Volatile Films released a feature length film titled The Significance of Seventeen starring Cindy Taylor; one theme addressed by the film is the high incidence of the number 17 and its function as 'the most random number' as described by MIT.
- In the film Three Days of the Condor, the title character played by Robert Redford works in section 17 of the CIA.
- In Halloween H20, Laurie Strode also known as Keri Tate, reveals her true identity to her boyfriend, Will. She tells him that she is related to Michael Myers and mistakenly says that her older sister, Judith Myers, died at the age of 17 years. However, in Halloween (1978), the dates on Judith's tombstone read November 10, 1947 - October 31, 1963. That would have meant that Judith was 15 years old at the time of her death. However, it is probable that the script writers wrote Judith's age as 17 so that it would correspond with Laurie Strodes age from the original film.
- 17 Again (2009), directed by Burr Steers
Anime and manga 
- Android 17, a character from the Dragon Ball series.
- Detective Konawaka from the Paprika anime has a strong dislike for the number 17.
- The computer game Half-Life 2 takes place in and around City 17.
- The visual novel Ever17 strongly revolves around the number 17.
- The title of Seventeen, a magazine.
- The title of Just Seventeen, a former magazine.
- The number 17 is a recurring theme in the works of novelist Steven Brust. All of his chaptered novels have either 17 chapters or two books of 17 chapters each. Multiples of 17 frequently appear in his novels set in the fantasy world of Dragaera, where the number is considered holy.
- In The Illuminatus! Trilogy, the symbol for Discordianism includes a pyramid with 17 steps because 17 has "virtually no interesting geometric, arithmetic, or mystical qualities". However, for the Illuminati, 17 is tied with the "23/17 phenomenon".
- In the Harry Potter universe
- 17 is the coming of age for wizards. It is equivalent to the usual coming of age at 18.
- 17 is the number of Sickles in one Galleon in the British wizards' currency
- According to Leon Kass, 17 has some significant meaning (as yet not known exactly) in the book of Genesis.
- In the Yasna of Zoroastrianism seventeen chapters were written by Zoroaster himself, these are the Gathas.
- The number of the raka'ahs that Muslims perform during Salah on a daily basis.
- The number of surat al-Isra in the Qur'an.
In sports 
- The most famous Ford number in the V8 Supercar championship, Driven by Dick Johnson to bring 5 Australian Touring Car Championships to his name. Now driven by son Steven Johnson.
- The number of a car in the NASCAR Sprint Cup Series owned by Roush Fenway Racing since 1999, Matt Kenseth has driven the car since its debut in 1999 until 2012. Consideration of replacing the number with the traditional Roush #6 for the 2013 season with new driver Ricky Stenhouse, Jr. has been considered.
- From 1987 until 2001, Hendrick Motorsports has used #17 for various drivers in the NASCAR Hall of Fame from 1987-90, and for a satellite team from 1991-92. It was also used by the team owner's son, who died in 2004.
- The jersey number 17 has been retired by several North American sports teams in honor of past playing greats or other key figures:
- In Major League Baseball:
- In the NBA:
- In the NHL:
- No NFL team has retired the number.
- The number that footballer Marc-Vivien Foé wore for the French clubs Lens and Lyon, retired by both clubs after his death from heart failure during a semifinal match in the 2003 FIFA Confederations Cup. Foé also wore the 17 shirt for the Cameroon national team at the time of his death.
In other fields 
- Described at MIT as 'the least random number', according to hackers' lore. This is supposedly because in a study where respondents were asked to choose a random number from 1 to 20, 17 was the most common choice.
- The number of guns in a 17-gun salute to U.S. Army, Air Force and Marine Corps Generals, and Navy and Coast Guard Admirals.
- The number of flames emanating from the grenade cap-badge of the Grenadier Guards.
- During the Second World War, the four-engined heavy bomber as flown by the USAAF and other Allies and known as "The Flying Fortress", was also known as the B-17.
- The maximum number of strokes of a Chinese radical.
- The number of syllables in a haiku (5+7+5).
- In the Nordic countries the seventeenth day of the year is considered the heart and/or the back of winter.
- "Highway 17" or "Route 17": See List of highways numbered 17 and List of public transport routes numbered 17.
- Seventeen, also known as Lock Seventeen, an unincorporated place in Clay Township, Tuscarawas County, Ohio.
- Seventeen was the former name of a yacht prior to being commissioned in the US Navy as the USS Carnelian (PY-19).
- In Italian culture, the number 17 is considered unlucky. When viewed as the Roman numeral, XVII, it is then changed anagrammatically to VIXI, which in the Latin language it translates to "I have lived", the perfect implying "My life is over." (c.f. "Vixerunt", Cicero's famous announcement of an execution.) Renault sold its "R17" model in Italy as "R177." See Cesana Pariol in the sport section about the name of curve 17.
- The fear of the number 17 is called 'heptadecaphobia' or 'heptakaidekaphobia'.
- Some species of cicadas have a life cycle of 17 years (i.e. they are buried in the ground for 17 years between every mating season).
- The number of special significance to Yellow Pig's Day and Hampshire College Summer Studies in Mathematics.
- The number to call Police in France.
- Force 17, a special operations unit of the Palestinian Fatah movement.
- The number of the French department Charente-Maritime
- The declared percentage alcohol content (by volume) of Baileys Irish Cream - an Irish whiskey and cream based liqueur, made by Gilbeys of Ireland.
- John H. Conway and Richard K. Guy, The Book of Numbers. New York: Copernicus (1996): 11. "Carl Friedrich Gauss (1777–1855) showed that two regular "heptadecagons" (17-sided polygon) could be constructed with ruler and compasses."
- Babbitt, Frank Cole (1936). Plutarch's Moralia V. Loeb
- Language Log: Another trip down Random Rd
- "Random numbers"
- McGuire, Gary. "There is no 16-Clue Sudoku: Solving the Sudoku Minimum Number of Clues Problem". arXiv:1201.0749. Retrieved 26 March 2012.
- For example, the patriarch Jacob lived 17 years years after his son Joseph went missing and presumed dead, and lived 17 years after their reunion in Egypt, and the lifespans of Abraham aged 175, Isaac aged 180, and Jacob aged 147 are not a coincidence. "(The sum of the factors in all three cases is 17; of what possible significance this is, I have no idea.)" Leon Kass, The beginning of wisdom: reading Genesis,(Simon and Schuster, 2003), ISBN 978-0-7432-4299-8, p. 413 n. 10 (citing Genesis 47:28), quote from p. 629 n. 18, found at Google Books. Retrieved June 17, 2009.
- Berlekamp, E. R.; Graham, R. L. (1970). "Irregularities in the distributions of finite sequences". Journal of Number Theory 2 (2): 152–161. doi:10.1016/0022-314X(70)90015-6. MR 0269605.
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