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

117 (one hundred () seventeen) is the natural number following 116 and preceding 118.
==In mathematics==
117 is the smallest possible length of the longest side of a Heronian tetrahedron (one whose sides are all rational numbers).〔Ivars Peterson, "(Perfect Pyramids )" ''MAA Online'' July 28, 2003〕〔Weisstein, Eric W. "Heronian Tetrahedron." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/HeronianTetrahedron.html〕
117 is a pentagonal number.
In base 10, 117 is a Harshad number.

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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