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・ 112th meridian east
・ 112th meridian west
・ 112th New York State Legislature
・ 112th New York Volunteer Infantry
・ 112th Ohio General Assembly
・ 112th Regiment of Foot
・ 112th Regiment of Foot (1794)
・ 112th Regiment of Foot (King's Royal Musqueteers)
・ 112th Regiment Royal Armoured Corps
・ 112th Special Operations Signal Battalion
・ 112th Street Bridge
・ 112th United States Colored Infantry
・ 112th United States Congress
・ 113
・ 113 (band)
113 (number)
・ 113 Amalthea
・ 113 and 117 Foregate Street, Chester
・ 113 BC
・ 113 East Roosevelt
・ 113 East Roosevelt (Phase II)
・ 113 series
・ 113 Squadron
・ 113 Squadron (Israel)
・ 113/114 Street, Edmonton
・ 1130
・ 1130 AM
・ 1130 in Ireland
・ 1130 in Norway
・ 1130 Skuld


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

113 (one hundred () thirteen) is the natural number following 112 and preceding 114. It is a prime number, so it can only be divided by one and itself.
==In mathematics==
113 is the 30th prime number, following 109 and preceding 127, a Sophie Germain prime, a Chen prime and a Proth prime as it is a prime number of the form 7 × 24 + 1. 113 is an Eisenstein prime with no imaginary part and real part of the form 3n - 1. In base 10, this prime is a primeval number, and a permutable prime with 131 and 311.
It is a highly cototient number and a centered square number.
355/113 approximates pi to six decimal places, with an error of less than 1/1133. This means that 113/355 approximates the reciprocal of pi.

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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