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199 (number) : ウィキペディア英語版 | 199 (number)
199 (one hundred () ninety-nine) is the natural number following 198 and preceding 200. ==In mathematics==
* 199 is an odd number * 199 is a centered triangular number * 199 is a centered 33-gonal number * 199 is a deficient number, as 1 is less than 199 * 199 is a Lucas number * 199 is a prime number * * 199 is a Chen prime * * 199 is a permutable prime which can have its digits switched, and create another prime number (991) * * 199 is a twin prime with 197 * * 199 is the sum of three consecutive primes: 61 + 67 + 71 * * 199 is the sum of five consecutive primes: 31 + 37 + 41 + 43 + 47 * * 199 is the fourth part of a prime quadruplet: 191, 193, 197, 199 * 199 is a square-free number * 199 is an odious number * 199 is the smallest natural number that takes more than two revolutions to get a Full Digital Root. Dt(199) = 1
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