Skewes's number
Large number used in number theory / From Wikipedia, the free encyclopedia
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In number theory, Skewes's number is any of several large numbers used by the South African mathematician Stanley Skewes as upper bounds for the smallest natural number for which
Unsolved problem in mathematics:
What is the smallest Skewes's number?
where π is the prime-counting function and li is the logarithmic integral function. Skewes's number is much larger, but it is now known that there is a crossing between and near It is not known whether it is the smallest crossing.