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195 (number) : ウィキペディア英語版 | 195 (number)
195 (one hundred () ninety-five) is the natural number following 194 and preceding 196. ==In mathematics==
* 195 is an odd number * 195 is a composite number * 195 is a deficient number, as 141 is less than 195 * 195 is a Harshad number * 195 is a lucky number * 195 is a sphenic number, in the middle of the prime quadruplet 191, 193, 197 and 199 * 195 is a square-free number * 195 is the sum of eleven consecutive primes: 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 * Although not itself prime, 195 passes through Ulam's sieve and thus is a lucky number * 195 is the smallest number expressed as a sum of distinct squares in 16 different ways * 195 is both a 21-gonal and 66-gonal number
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