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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: , , , and . 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.
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