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189 is the number following 188 and preceding 190.[1], and its factors are {1,3,7,9,21,27,63,189}.


Properties

  • It is an odd number[2].
  • The 189th element has not been discovered.


Approximations

Notation Expression
Up-arrow notation 13 ↑ 2
Fast-growing hierarchy f1(94)
Hardy hierarchy Hω(94)
Middle-growing hierarchy m(ω,7)


Sources

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