219 (number)
219 (two hundred [and] nineteen) is the natural number following 218 and preceding 220.
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| Cardinal | two hundred nineteen | |||
| Ordinal | 219th (two hundred nineteenth) | |||
| Factorization | 3 × 73 | |||
| Greek numeral | ΣΙΘ´ | |||
| Roman numeral | CCXIX | |||
| Binary | 110110112 | |||
| Ternary | 220103 | |||
| Octal | 3338 | |||
| Duodecimal | 16312 | |||
| Hexadecimal | DB16 | |||
Mathematics
- 219 is a happy number.[1]
- Mertens function(219) = 4, a record high.[2]
- There are 219 partially ordered sets on four labeled elements.[3]
- 219 is the smallest number that can be represented as a sum of four positive cubes in two different ways.[4]
- There are 219 different space groups, discrete and full-dimensional sets of symmetries of three-dimensional space or of crystal structures.
References
- Sloane, N. J. A. (ed.). "Sequence A007770 (Happy numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- Sloane, N. J. A. (ed.). "Sequence A051400 (Smallest value of x such that M(x)=n, where M() is Mertens's function)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- Sloane, N. J. A. (ed.). "Sequence A001035 (Number of partially ordered sets ("posets") with n labeled elements (or labeled acyclic transitive digraphs))". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- Sloane, N. J. A. (ed.). "Sequence A025420 (Least sum of 4 positive cubes in exactly n ways)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation..
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