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・ 107th regiment
・ 107th Regiment of Foot (1794)
・ 107th Regiment of Foot (Bengal Light Infantry)
・ 107th Regiment of Foot (disambiguation)
・ 107th Regiment of Foot (Queen's Own Royal Regiment of British Volunteers)
・ 107th Regiment Royal Armoured Corps
・ 107th Street (Metra station)
・ 107th Street – Beverly Hills (Metra station)
・ 107th United States Congress
・ 107th Virginia General Assembly
・ 108
・ 108 (artist)
・ 108 (band)
・ 108 (disambiguation)
・ 108 (emergency telephone number)
108 (number)
・ 108 Aquarii
・ 108 BC
・ 108 Demon Kings
・ 108 Hecuba
・ 108 Hospital
・ 108 Kalthur
・ 108 Martyrs of World War II
・ 108 Mile Lake
・ 108 Mile Ranch
・ 108 North State Street
・ 108 Shop
・ 108 Squadron SAAF
・ 108 St Georges Terrace
・ 108 Stars


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108 (number) : ウィキペディア英語版
108 (number)

108 (one hundred () eight) is the natural number following 107 and preceding 109.
== In mathematics ==

108 (or nine dozen) is an abundant number and a semiperfect number. It is a tetranacci number.
108 is the hyperfactorial of 3 since it is of the form 1^1 \cdot 2^2 \cdot 3^3.
108 is divisible by the value of its φ function, which is 36. 108 is also divisible by the total number of its divisors (12), hence it is a refactorable number.
In Euclidean space, the interior angles of a regular pentagon measure 108 degrees each.
There are 108 free polyominoes of order 7.
In base 10, it is a Harshad number and a self number.
The equation 2\sin\left(\frac\right) = \phi results in the golden ratio.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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