73 (number)
From Wikipedia, the free encyclopedia
73 (seventy-three) is the natural number following 72 and preceding 74. In English, it is the smallest integer with twelve letters in its spelled out name.
| Cardinal | 73 seventy-three |
| Ordinal | 73rd seventy-third |
| Factorization | prime |
| Divisors | 1, 73 |
| Roman numeral | LXXIII |
| Binary | 1001001 |
| Hexadecimal | 49 |
[edit] In mathematics
Seventy-three is the 21st prime number. The previous is seventy-one, with which it comprises the 8th twin prime. It is also a permutable prime with thirty-seven. 73 is a star number.
Every positive integer is the sum of at most 73 sixth powers (see Waring's problem).
In base 5, the smallest prime with a composite sum of digits is 73.
73 is a repdigit in base 8 (111).
[edit] In science
- The atomic number of tantalium
In astronomy,
- Messier object M73, a magnitude 9.0 apparent open cluster in the constellation Aquarius
- The New General Catalogue object NGC 73, a barred spiral galaxy in the constellation Cetus
- The Saros number of the solar eclipse series which began on 717 BC July 16 and ended on 582 September 3. The duration of Saros series 73 was 1298.1 years, and it contained 73 solar eclipses.
[edit] In other fields
Seventy-three is also:
- The total number of books in the Holy Bible in the Catholic version if the Book of Lamentations is counted as a book separate from the Book of Jeremiah.
- The designation of USA Interstate 73, a freeway in North Carolina.
- The registry of the U.S. Navy's nuclear aircraft carrier USS George Washington (CVN-73), named after U.S. President George Washington.
- The best-known car number of retired NASCAR driver Phil Barkdoll.
- In baseball, the single-season home run record set by Barry Bonds in 2001.
- In basketball, the number of games the Philadelphia 76ers lost in the 1972-73 season, the most losses in NBA history.
- The year AD 73, 73 BC, or 1973.
- Amateur radio operators often use the number 73 as a way of saying "best regards" (typically when ending a QSO). [1] This is the reason for the name of the magazine 73 (also known as 73 Amateur Radio Today, an amateur radio magazine published by Wayne Green (who also started Byte magazine) from 1960 to 2003.
- Each of the five seasons of the Discordian calendar has 73 days.
- The name of a 1980's children's television programme in the United Kingdom. It ran from 1982-1988 and starred Sandi Toksvig
- The Blues Image song "Ride Captain Ride" (1970) begins with "73 men sailed out on the San Francisco Bay"
