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23 (twenty-three) is the natural number following 22 and preceding 24.

1 In mathematics

Twenty-three is the ninth prime number, the sequence continues 29, 31, 37, 41,... Twenty-three is also a factorial prime, a Sophie Germain prime, a safe prime, a Woodall prime, and a Smarandache-Wellin prime.

23 also has the distinction of being one of two integers that can't be expressed as the sum of 8 cubes (we allow 0^3 since zero is indeed an integer). The other integer is 239.

23 is a Wedderburn-Etherington numberA Wedderburn-Etherington number counts how many weakly binary trees can be constructed such that each graph vertex (not counting the root vertex) is adjacent to no more than three other such vertices, for a given number of nodes. The first few Wedderburn-.

2 In other fields

The 23rd moon of Jupiter is CarmeCarme ("KAR mee") is one of Jupiter's moons. It was discovered by Seth Barnes Nicholson at Mount Wilson Observatory in California in July 1938. It is named after the mythological Carme, mother by Zeus of Britomartis, a Cretan goddess. Carme did not receiv.

Twenty-three is:

• The atomic numberThe atomic number Z is a term used in chemistry and physics to represent the number of protons found in the nucleus of an atom. In an atom of neutral charge, the number of electrons typically equals the atomic number. The atomic number originally meant th of vanadiumtitanium vanadium chromium V Nb Full table General Name, Symbol, Numbervanadium, V, 23 Chemical series transition metals Group, Period, Block 5, 4 , d Density, Hardness 6110 kg/m3, 7. 0 Appearance silvery grey metallic Atomic properties Atomic weight 50..
• In early 20th century19th century 20th century 21st century more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s As a means of recording the passage of time, the 20th century was that century which lasted from 1901- 2000 in the sense of the Gre United StatesThe United States of America also referred to as the United States U. America ¹ or the States is a federal republic in central North America, stretching from the Atlantic in the east to the Pacific Ocean in the west. It shares land borders with Canada in slang, it meant to leave a place. (From the phrase 23 skiddoo ; the origins of the phrase are largely unknown).
• The sacred number (along with 17 and 5) of Eris, goddess of discord, according to the Principia Discordia; it is the number of the Illuminati.
• Like 13, sometimes considered unlucky or otherwise significant (as in the occult writings of Aleister Crowley and William S. Burroughs).
• 23, a German movie about Karl Koch.
• A telegraphers' code meaning "line break".
• Michael Jordan's jersey number when he played for the Chicago Bulls basketball team.
• David Beckham's squad number at Real Madrid football ( soccer) club.
• When mathematician John Forbes Nash suffered from schizophrenic delusions, he said that Life Magazine had run a cover story of him disguised as Pope John XXIII as his name was John and his favorite prime number was 23.
• The number of chromosomes in a human germline cell

• Historical years: 23 A.D., 23 B.C., or 1923