198 (number)
| ||||
|---|---|---|---|---|
| Cardinal | one hundred ninety-eight | |||
| Ordinal | 198th (one hundred ninety-eighth) | |||
| Factorization | 2 × 32 × 11 | |||
| Greek numeral | ΡϞΗ´ | |||
| Roman numeral | CXCVIII, cxcviii | |||
| Binary | 110001102 | |||
| Ternary | 211003 | |||
| Senary | 5306 | |||
| Octal | 3068 | |||
| Duodecimal | 14612 | |||
| Hexadecimal | C616 | |||
198 (one hundred [and] ninety-eight) is the natural number following 197 and preceding 199.
In mathematics
[edit]- 198 is the smallest number that can be written as a sum of four positive squares in ten different ways: 198 = 12 + 22 + 72 + 122 = 12 + 42 + 92 + 102 = 22 + 32 + 42 + 132 = 22 + 32 + 82 + 112 = 22 + 52 + 52 + 122 = 22 + 72 + 82 + 92 = 32 + 32 + 62 + 122 = 32 + 52 + 82 + 102 = 42 + 52 + 62 + 112 = 62 + 72 + 72 + 82.[1][2]
- 198 is a Pell–Lucas number. Its corresponding Pell number is 70.[3]
- 198 is a Harshad number, which means it is divisible by the sum of its digits.[4]
References
[edit]- ^ "198". NumberADay. Mathematical Association of America. 2012-10-25. Retrieved 2023-06-04.
- ^ "A025366 - OEIS". oeis.org. Retrieved 2023-06-04.
- ^ "A002203 - OEIS". oeis.org. Retrieved 2023-06-04.
- ^ "A005349 - OEIS". oeis.org. Retrieved 2023-06-04.
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