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157 (one hundred () fifty-seven) is the number following 156 and preceding 158. ==In mathematics== 157 is a prime number. The next prime is 163 and the previous prime is 151, with which 157 forms a prime triplet. Taking the arithmetic mean of those primes yields 157, thus it is a balanced prime. In base 10, 1572 is 24649, and 1582 is 24964, which uses the same digits. Numbers having this property are listed in . The previous entry is 13, and the next entry after 157 is 913. 157 is a repunit in base 12 (111), so it is a unique prime in the same base. The simplest right angle triangle with rational sides that has area 157 has the longest side with a denominator of 45 digits. 157 is also an emirp, a Chen prime, and the least irregular prime with index 2. 157 is the largest known prime ''p'' which is also prime. (see ) 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「157 (number)」の詳細全文を読む スポンサード リンク
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