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・ 138th Illinois Volunteer Infantry Regiment
・ 138th Indiana Infantry Regiment
・ 138th Infantry Regiment (United States)
・ 138th meridian
・ 138th meridian east
・ 138th meridian west
・ 138th New York State Legislature
・ 138th Ohio Infantry
・ 138th Pennsylvania Infantry
・ 138th Rifle Division (Soviet Union)
・ 138th Street
・ 138th Street (IRT Third Avenue Line)
・ 138th Street – Grand Concourse (IRT Jerome Avenue Line)
・ 139
・ 139 & Lenox
139 (number)
・ 139 BC
・ 139 Juewa
・ 139 Movement
・ 139 Tauri
・ 1390
・ 1390 Abastumani
・ 1390 AM
・ 1390 in Ireland
・ 1390 Yellow River flood
・ 13906 Shunda
・ 1390s
・ 1390s BC
・ 1390s in art
・ 1390s in England


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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.

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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