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139 (number) : ウィキペディア英語版 | 139 (number)
139 (One hundred () thirty-nine) is the natural number following 138 and preceding 140. ==In mathematics== 139 is the 34th prime number. It is a twin prime with 137. Because 141 is a semiprime, 139 is a Chen prime. 139 is the smallest prime before a prime gap of length 10.〔Wells, D. ''The Penguin Dictionary of Curious and Interesting Numbers'' London: Penguin Group. (1987): 139〕 This number is the sum of five consecutive prime numbers (19 + 23 + 29 + 31 + 37). It is the smallest factor of 64079. It is also the smallest factor of the first nine terms of the Euclid–Mullin sequence, making it the tenth term. 139 is a happy number and a strictly non-palindromic number.
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