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| 197 (number) ： ウィキペディア英語版 |
197 (number)
197 (one hundred () ninety-seven) is the natural number following 196 and preceding 198.
==In mathematics==
* 197 is an odd number
* 197 is a prime number
*
* 197 is a Chen prime
*
* 197 is an Eisenstein prime with no imaginary part
*
* 197 is a strong prime
*
* 197 is a twin prime with 199
*
* 197 is the third of a prime quadruplet: 191, 193, 197, 199
*
* 197 is the smallest prime number that is the sum of 7 consecutive primes: 17 + 19 + 23 + 29 + 31 + 37 + 41
*
* 197 is the sum of the first twelve prime numbers: 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37
* 197 is a centered heptagonal number, a centered figurate number that represents a heptagon with a dot in the center and all other dots surrounding the center dot in successive heptagonal layers
* 197 is a deficient number, as 1 is less than 197
* 197 is a Keith or repfigit number
* 197 is a palindromic prime in base 14 (101).
* 197 is a square-free number
* 197 is a super Catalan number
* 197 is an Ulam number
* 197 is the sum of all digits of all two-digit prime numbers: 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
* The binary number of 197 has four 1 digits and four zeroes (11000101)
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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