228 (number)
228 (two hundred [and] twenty-eight) is the natural number following 227 and preceding 229.
| ||||
---|---|---|---|---|
Cardinal | two hundred twenty-eight | |||
Ordinal |
228th (two hundred and twenty-eighth) | |||
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.
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