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155 is the number following 154 and preceding 156.[1], and its factors are {1,5,31,155}.


Properties

  • It is an odd number[2].
  • The 155th element has not been discovered.


Approximations

Notation Expression
Up-arrow notation 12 ↑ 2
Fast-growing hierarchy f1(77)
Hardy hierarchy Hω(77)
Middle-growing hierarchy m(ω,7)


Sources

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