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・ 128th Infantry Brigade (United Kingdom)
・ 128th Infantry Regiment (United States)
・ 128th IOC Session
・ 128th Mechanized Brigade (Ukraine)
・ 128th meridian
・ 128th meridian east
・ 128th meridian west
・ 128th New York State Legislature
・ 128th New York Volunteer Infantry
・ 128th Ohio General Assembly
・ 128th Ohio Infantry
・ 128th Pioneers
・ 128th Regiment of Foot
・ 129
・ 129 (disambiguation)
129 (number)
・ 129 Antigone
・ 129 BC
・ 129 Die in Jet!
・ 129 West Trade
・ 1290
・ 1290 AM
・ 1290 Chihli earthquake
・ 1290 in Ireland
・ 1290 in poetry
・ 1290s
・ 1290s BC
・ 1290s in architecture
・ 1290s in art
・ 1290s in England


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129 (number) : ウィキペディア英語版
129 (number)

129 (one hundred () twenty-nine) is the natural number following 128 and preceding 130.
==In mathematics==
129 is the sum of the first ten prime numbers. It is the smallest number that can be expressed as a sum of three squares in four different ways: 11^2+2^2+2^2, 10^2+5^2+2^2, 8^2+8^2+1^2, and 8^2+7^2+4^2.
129 is the product of only two primes, 3 and 43, making 129 a semiprime. Since 3 and 43 are both Gaussian primes, this means that 129 is a Blum integer.
129 is a repdigit in base 6 (333).
129 is a happy 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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