Английская Википедия:219 (number)

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Шаблон:Infobox number 219 (two hundred [and] nineteen) is the natural number following 218 and preceding 220.

In 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

Шаблон:Reflist

Шаблон:Integers Шаблон:Num-stub