7 Lucky Movie Number
7 Lucky Movie Number
7 ( seven ) is the natural number following 6 and preceding 8.
In mathematics
- Seven is the fourth prime number. It is not only a Mersenne prime (since 2 3 − 1 = 7) but also a double Mersenne prime since it is itself the exponent for another Mersenne prime (127). It is also a Newman-Shanks-Williams prime, a Woodall prime, a factorial prime, a lucky prime, a happy number, a safe prime and the fourth Heegner number.
- Seven is the lowest number which cannot be represented as the sum of the squares of three integers.
- Seven is the aliquot sum of one number, the cubic number 8 and is the base of the 7-aliquot tree.
- n = 7 is the first natural number for which the next statement does not hold: "Two nilpotent endomorphisms from C n with the same minimal polynomial and the same rank are similar."
- 7 is the only dimension, besides the familiar 3, in which a vector cross product can be defined.
- 999,999 divided by 7 is exactly 142,857. Therefore, when a vulgar fraction with 7 in the denominator is converted to a decimal expansion, the result has the same six-digit repeating sequence after the decimal point, but the sequence can start with any of those six digits. For example, 1/7 = 0.142 857 142.... and 2/7 = 0.285 714 285...
- A seven-sided shape is a heptagon. The regular n -gons for n ≤ 6 can be constructed by compass and straightedge alone, but the regular heptagon cannot. Figurate numbers representing heptagons (including seven) are called heptagonal numbers. Seven is also a centered hexagonal number.
- There are seven frieze groups, the groups consisting of symmetries of the plane whose group of translations is isomorphic to the group of integers.
- There are seven fundamental types of catastrophes.
- Seven is the sum of any two opposite sides on a standard six-sided die. When rolling two standard six-sided dice, seven has a 6 in 36 (or 1/6th) probability of being rolled (1–6, 6–1, 2–5, 5–2, 3–4, or 4–3), the greatest of any number.
- The Millennium Prize Problems are seven problems in mathematics that were stated by the Clay Mathematics Institute in 2000. Currently, six of the problems remain unsolved.
In numeral systems
In quaternary, 7 is the smallest prime with a composite sum of digits.
List of basic calculations
Evolution of the glyph
In the beginning, various Hindus wrote 7 more or less in one stroke as a curve that looks like an uppercase J vertically inverted. The western Ghubar Arabs' main contribution was to make the longer line diagonal rather than straight, though they showed some tendencies to making the character more rectilinear. The eastern Arabs developed the character from a 6-look-alike into an uppercase V-look-alike. Both modern Arab forms influenced the European form, a two-stroke character consisting of a horizontal upper line joined at its right to a line going down to the bottom left corner, a line that is slightly curved in some font variants. As is the case with the European glyph, the Cham and Khmer glyph for 7 also evolved to look like their glyph for 1, though in a different way, so they were also concerned with making their 7 more different. For the Khmer this often involved adding a horizontal line above the glyph. This is analogous to the horizontal stroke through the middle that is sometimes used in handwriting in the Western world but which is almost never used in computer fonts. This horizontal stroke is, however, important to distinguish the glyph for seven from the glyph for one in writings that use a long upstroke in the glyph for one.
On the seven-segment displays of pocket calculators and digital watches, 7 is the number with the most common glyph variation (0, 6 and 9 also have variant glyphs). Most calculators use three line segments, but on Sharp, Casio, and a few other brands of calculators, 7 is written with four line segments because, in Japan and Korea, 7 is written as ① in the illustration to the right.
While the shape of the 7 character has an ascender in most modern typefaces, in typefaces with text figures the character usually has a descender, as, for example, in
.
Most people in Europe, Latin America, and New England, write 7 with a line in the middle ("
7
"), sometimes with the top line crooked. The line through the middle is useful to clearly differentiate the character from the number one, as these can appear similar when written in certain styles of handwriting. This glyph is used in official handwriting rules for primary school in Russia.
In science
Physics
- There are 7 SI base units. These are a coherent set of units defined to measure 7 basic physical properties: metre, kilogram, second, ampere, kelvin, mole, candela. The 7 SI base units are used to define all other SI units, which are known as SI derived units.
- Isaac Newton identified 7 colours of the rainbow - red, orange, yellow, green, blue, indigo, and violet
Chemistry
- an heptamer is a compound made of seven sub-units
- A neutral pH value between acidity and alkalinity
- The atomic number of nitrogen
- Heptane is an alkane with 7 carbon atoms in each molecule
- A period 7 element has 7 electron shells
- The number of periods, or horizontal rows of elements, in the periodic table
Biology
- Almost all mammals have 7 cervical vertebrae
- There are 7 types of virus according to the Baltimore classification
- The number of spots on a seven-spot ladybird
Astronomy
- The number of daughters of Atlas in the Pleiades (also called the "Seven Sisters")
- The number of stellar objects in the solar system visible to the naked eye from Earth— the Sun, the Moon and the five classical naked eye planets: Mars, Mercury, Jupiter, Venus, and Saturn.
- Messier object M7, a magnitude 3.5 open cluster in the constellation Scorpius.
- The New General Catalogue object NGC 7, a 14th magnitude spiral galaxy in the constellation Sculptor.
- The number of saints appearing in a constellation called "Saptharishi Mandalam" in Indian astronomy.
- The number of stars in the constellations of the Big Dipper and Orion.
- The Saros number of the solar eclipse series which began on -2590 April 8 and ended on -1310 May 16. The duration of Saros series 7 was 1,280.1 years, and it contained 72 solar eclipses.
- The Saros number of the lunar eclipse series which began on -2595 July 15 and ended on -1008 February 22. The duration of Saros series 7 was 1,586.6 years, and it contained 89 lunar eclipses.
- The Roman numeral VII stands for white dwarfs in the Yerkes spectral classification scheme.
- The Roman numeral VII (usually) stands for the seventh-discovered satellite of a planet or minor planet (e.g., Jupiter VII).
Psychology
- The Magical Number Seven, Plus or Minus Two
In the classical world
In classical antiquity:
- Seven against Thebes
-
Seven Emperors (and period; Rome, history)
- Julius Caesar, Augustus, Galba, Hadrian, Nerva, Sallust, Vespasian
- Seven hills of Rome
- Seven Liberal Arts
- Seven Sages
- Seven Wonders of the ancient world
In religion
Christianity
The number seven (7) in the seven days of Creation is typological and the number seven appears commonly elsewhere in the Bible. These include:
- Seven days of Creation (Genesis 1). God rested on and sanctified the seventh day (Sabbath)
- Seven years of plenty and seven years of famine in Pharaoh's dream (Genesis 41)
- Seven days of the feast of Passover (Exodus 13:3-10)
- Seven day week and the pattern concerning distribution and use of manna (Exodus 16)
-
Seven year c
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