103 is the natural number following 102 and preceding 104. When "and" is required for the number name, 103 is the smallest number requiring 18 letters when spelled out in English.

In mathematics

One hundred ^* three is the 27th prime number. The previous prime is 101, making them both twin primes.

103 is a strictly non-palindromic number.

In science

• The atomic number of lawrencium, an actinide.

In astronomy,

Messier object M103, a magnitude 7.0 open cluster in the constellation Cassiopeia

The New General Catalogue object NGC103, an open cluster in the constellation Cassiopeia

Asteroid 103 Hera

The Saros number of the solar eclipse series which began on 387 April 4 and ended on 1667 May 22. The duration of Saros series 103 was 1280.1 years, and it contained 72 solar eclipses.

The Saros number of the lunar eclipse series which began on 454 August 24 and ended on 1951 February 21. The duration of Saros series 103 was 1496.5 years, and it contained 84 lunar eclipses.

• The number of 'non-stellar objects' - galaxies, nebulae and star clusters - listed by Charles Messier in his catalogue in 1784. (Note: this was later extended to 110 objects)

In other fields

• The flight number of Pan Am Flight 103, which crashed over Lockerbie, Scotland and was at one time called "the air-disaster of the century".
• The lowest number that is impossible to score with two darts.
• The numbers of Germans expelled from Great Britain between 1907 and 1914 for soliciting or importuning.
• The number of species of crows.
• The year AD 103 or 103 BC.

Integers

103 (nombre) | 103 | 103 (getal) | 103 | 103 (число) | 103 (število) | 103 (tal) | 103 (số) | 103