Wikipedia
197 (number)
197 (one hundred [and] ninety-seven) is the natural number following 196 and preceding 198.
| Cardinal | one hundred ninety-seven |
|---|---|
| Ordinal | 197th (one hundred ninety-seventh) |
| Factorization | prime |
| Prime | 45th |
| Greek numeral | ΡϞΖ´ |
| Roman numeral | CXCVII |
| Binary | 110001012 |
| Ternary | 210223 |
| Senary | 5256 |
| Octal | 3058 |
| Duodecimal | 14512 |
| Hexadecimal | C516 |
In mathematics
- 197 is a prime number, 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, and 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 Schröder–Hipparchus number, counting for instance the number of ways of subdividing a heptagon by a non-crossing set of its diagonals.[1]
In other fields
197 is also:
- A police emergency telephone number in Tunisia
- Number enquiry telephone number in Nepal
- a song by Norwegian alternative rock group Major Parkinson from their self-titled debut album
See also
References
- ^ Sloane, N. J. A. (ed.). "Sequence A001003 (Schroeder's second problem (generalized parentheses); also called super-Catalan numbers or little Schroeder numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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