81 (number)
Natural number From Wikipedia, the free encyclopedia
Natural number From Wikipedia, the free encyclopedia
81 (eighty-one) is the natural number following 80 and preceding 82.
81 is:
The inverse of 81 is 0.012345679 recurring, missing only the digit "8" from the complete set of digits. This is an example of the general rule that, in base b,
omitting only the digit b−2.
Eighty-one is also:
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