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| 181 (number) ： ウィキペディア英語版 |
181 (number)
181 (one hundred () eighty-one) is the natural number following 180 and preceding 182.
==In mathematics==
* 181 is an odd number
* 181 is a centered number
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* 181 is a centered pentagonal number
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* 181 is a centered 12-gonal number
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* 181 is a centered 18-gonal number
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* 181 is a centered 30-gonal number
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* 181 is a centered square number
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* 181 is a star number that represents a centered hexagram (as in the game of Chinese checkers)
* 181 is a deficient number, as 1 is less than 181
* 181 is an odious number
* 181 is a prime number
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* 181 is a Chen prime
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* 181 is a dihedral prime
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* 181 is a full reptend prime
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* 181 is a palindromic prime
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* 181 is a strobogrammatic prime, the same when viewed upside down
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* 181 is a twin prime with 179
* 181 is a square-free number
* 181 is an undulating number, if written in the ternary, the negaternary, or the nonary numeral systems
* 181 is the difference of 2 square numbers: 912 – 902
* 181 is the sum of 2 consecutive square numbers: 92 + 102
* 181 is the sum of 5 consecutive prime numbers: 29 + 31 + 37 + 41 + 43
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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