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193 (one hundred () ninety-three) is the natural number following 192 and preceding 194. ==In mathematics== * 193 is an odd number * 193 is a centered 32-gonal number * 193 is a happy number * 193 is a lucky number * 193 is an odious number * 193 is a square-free number * 193 is the sum of 2 square numbers: 122 + 72 (or 144 + 49) * 193 is the difference of 2 square numbers: 972 - 962 (or 9409 - 9216) * 193 is a prime number * * 193 is a Cuban prime * * 193 is a full reptend prime * * 193 is a Pierpont prime * * 193 is a Pillai prime * * 193 is a Proth prime, as it is 3 × 26 + 1 * * 193 is a Twin prime with 191 * * 193 is the only odd prime ''p'' known for which 2 is not a primitive root of .〔E. Friedman, "(What's Special About This Number )" Accessed 2 January 2006 and again 15 August 2007.〕 * 193 is a Proth prime as it is 3 × 26 + 1. It can be written as the difference between the product and the sum of the first four primes * 193 is the sum of 2 squares: 122 + 72 * 193 is a twin number * 193 is a twin prime with 191 * 193/71 is the most accurate approximation of Euler's Number (e) such that both the numerator and the denominator are integers less than 200 (approx. 99.99897% accurate) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「193 (number)」の詳細全文を読む スポンサード リンク
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