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129 (number)
| Field | Value |
|---|---|
| number | 129 |
| divisor | 1, 3, 43, 129 |
129 (one hundred [and] 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.
129 is a centered octahedral number.
References
References
- "Sloane's A016105 : Blum integers". OEIS Foundation.
- "Sloane's A007770 : Happy numbers". OEIS Foundation.
- {{cite OEIS. A001845. Centered octahedral numbers (crystal ball sequence for cubic lattice)
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