93 (number)

93 (ninety-three) is the natural number following 92 and preceding 94.

In mathematics

93 is:

• the twenty-eighth distinct semiprime^[1] and the ninth of the form (3.q).^[2]
• the first number in the third triplet of consecutive semiprimes, 93, 94, and 95.^[3]
• a Blum integer, since its two prime factors, 3 and 31 are both Gaussian primes.^[4]
• a repdigit in base 5 (333₅),^[5] and 30 (33₃₀).
• palindromic in bases 2, 5, and 30.
• a lucky number.^[6]
• a cake number.^[7]
• an idoneal number.^[8]

There are 93 different cyclic Gilbreath permutations on 11 elements,^[9] and therefore there are 93 different real periodic points of order 11 on the Mandelbrot set.^[10]

In other fields

Ninety-three is:

• The atomic number of neptunium, an actinide.
• The code for international direct dial phone calls to Afghanistan.
• One of two ISBN Group Identifiers for books published in India.
• The number of the French department Seine-Saint-Denis, and as such used by many French gangsta rappers and those emulating their speech.^[11][12]

In classical Persian finger counting, the number 93 is represented by a closed fist. Because of this, classical Arab and Persian poets around 1 CE referred to someone's lack of generosity by saying that the person's hand made "ninety-three".^[13]

See also

• 93, a year in the Julian calendar
• List of highways numbered 93
• Ninety-Three (Quatrevingt-treize), a novel concerning the French Revolution by Victor Hugo
• 93 (Thelema), a greeting among Thelemites based on the numerological value of Thelema (Will) and Agape (Love) in Greek letters.
• Babia 93, an album from a Pakistani pop singer Sajjad Ali
• London's 93 Feet East music venue
• Los Angeles 93 KHJ radio
• United Airlines Flight 93, one of the airplanes hijacked on September 11, 2001.

References

External links

Wikimedia Commons has media related to 93 (number).

• On the Number 93