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・ 29th Field Artillery Regiment
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290 (number)
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・ 290th Military Police Brigade
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290 (number) : ウィキペディア英語版
290 (number)

290 (two hundred () ninety) is the natural number after 289 and before 291.
==In mathematics==
The product of three primes, 290 is a sphenic number, and the sum of four consecutive primes (67 + 71 + 73 + 79). The sum of the squares of the divisors of 17 is 290. If you multiply 5, 2, and 29, you get 290.
Not only is it a nontotient and a noncototient, it is also an untouchable number.
290 is the 16th member of the Mian–Chowla sequence; it can't be obtained as the sum of any two previous terms in the sequence.
See also the Bhargava–Hanke 290 theorem.

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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