228 (number)
From Infogalactic: the planetary knowledge core
228 (two hundred [and] twenty-eight) is the natural number following 227 and preceding 229.
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|---|---|---|---|---|
| Cardinal | two hundred twenty-eight | |||
| Ordinal | 228th (two hundred and twenty-eighth) |
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| Factorization | 22× 3 × 19 | |||
| Prime | no | |||
| Roman numeral | CCXXVIII | |||
| Binary | 111001002 | |||
| Ternary | 221103 | |||
| Quaternary | 32104 | |||
| Quinary | 14035 | |||
| Senary | 10206 | |||
| Octal | 3448 | |||
| Duodecimal | 17012 | |||
| Hexadecimal | E416 | |||
| Vigesimal | B820 | |||
| Base 36 | 6C36 | |||
228 is a refactorable number,[1] and a practical number.[2] There are 228 matchings in a ladder graph with five rungs.[3] 228 is the smallest even number n such that the numerator of the nth Bernoulli number is divisible by a nontrivial square number that is relatively prime to n.[4]
References
- ↑ "Sloane's A033950 : Refactorable numbers", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A005153 : Practical numbers", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A030186 : a(n) = 3a(n-1) + a(n-2) - a(n-3)", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ "Sloane's A090943 : Even numbers n such that N(n) is divisible by a nontrivial square, m^2, say and GCD(n,m)=1, where N(n) is the numerator of the Bernoulli number B(n)", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
