93 (number)

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

In mathematics

93 is:

• the 28th distinct semiprime<ref>Template:Cite OEIS</ref> and the 9th of the form (3.q) where q is a higher prime.<ref>Template:Cite OEIS</ref>
• the first number in the 3rd triplet of consecutive semiprimes, 93, 94, 95.<ref>Template:Cite OEIS</ref>
• with an aliquot sum of 35; itself a semiprime, within an aliquot sequence (93,35,13,1,0) of three numbers to the Prime 13 in the 13-Aliquot tree.
• a Blum integer, since its two prime factors, 3 and 31 are both Gaussian primes.<ref>Template:Cite OEIS</ref>
• a repdigit in base 5 (333₅),<ref>Template:Cite OEIS</ref> and 30 (33₃₀).
• palindromic in bases 2, 5, and 30.
• a lucky number.<ref>Template:Cite OEIS</ref>
• a cake number.<ref>Template:Cite OEIS</ref>
• an idoneal number.<ref>Template:Cite OEIS</ref>

There are 93 different cyclic Gilbreath permutations on 11 elements,<ref>Template:Cite OEIS</ref> and therefore there are 93 different real periodic points of order 11 on the Mandelbrot set.<ref>Template:Citation.</ref>

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, a Paris suburb with high proportions of immigrants and low-income people, and as such used by many French rappers and those emulating their speech.<ref>Template:Citation.</ref><ref>Template:Citation.</ref>

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".<ref>Template:Citation.</ref>

See also

• 93 (Thelema), a greeting among Thelemites based on the numerological (gematric) value of Thelema (Will) and Agape (Love) in Greek letters.<ref>Template:Cite book</ref>