227 (number)
| ||||
|---|---|---|---|---|
| Cardinal | two hundred twenty-seven | |||
| Ordinal |
227th (two hundred and twenty-seventh) | |||
| Factorization | 227 | |||
| Prime | yes | |||
| Roman numeral | CCXXVII | |||
| Binary | 111000112 | |||
| Ternary | 221023 | |||
| Quaternary | 32034 | |||
| Quinary | 14025 | |||
| Senary | 10156 | |||
| Octal | 3438 | |||
| Duodecimal | 16B12 | |||
| Hexadecimal | E316 | |||
| Vigesimal | B720 | |||
| Base 36 | 6B36 | |||
227 (two hundred [and] twenty-seven) is the natural number between 226 and 228. It is also a prime number.
In mathematics
227 is a twin prime and the start of a prime triplet (with 229 and 233).[1] It is a safe prime, as dividing it by two and rounding down produces the Sophie Germain prime 113.[2] It is also a regular prime,[3] a Pillai prime,[4] a Stern prime,[5] and a Ramanujan prime.[6]
The 227th harmonic number is the first to exceed six.[7] There are 227 different connected graphs with eight edges,[8] and 227 independent sets in a 3 × 4 grid graph.[9]
See also
- 227 (TV series), an NBC sitcom which ran from 1985-1990.
References
- ↑ "Sloane's A022004". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A005385". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A007703 : Regular primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A063980 : Pillai primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A042978". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A104272 : Ramanujan primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A002387 : Least k such that H(k) > n, where H(k) is the harmonic number sum_{i=1..k} 1/i". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A002905". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A051736". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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