Definition:Skewes' Number
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Definition
Skewes' number is:
- $10^{10^{10^{34} } }$
In Knuth notation this can be presented as:
- $10 \uparrow \paren {10 \uparrow \paren {10 \uparrow 34} }$
Also known as
The name can also be seen presented as:
- Skewes Number
- Skewes's Number
Source of Name
This entry was named for Stanley Skewes.
Historical Note
Stanley Skewes deduced the number which now bears his name in $1933$.
Godfrey Harold Hardy referred to it as:
- the largest number which has ever served any definite purpose in mathematics.
By way of comparison, the number of particles in the universe has been estimated at somewhere between $10^{80}$ and $10^{87}$.
However, Skewes' estimate has been reduced somewhat more recently.
For example, Hermanus Johannes Joseph te Riele has shown that there are many $n$ between $6 \cdotp 62 \times 10^{370}$ and $6 \cdotp 69 \times 10^{370}$ for which $\map \pi n$ is less than $\ds \int_2^n \frac {\d x} {\ln x}$.
Sources
- 1933: S. Skewes: On the difference $\map \pi x − \map \Li x$ (I) (J. London Math. Soc. Vol. 8, no. 4: pp. 277 – 283)
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $10^{10^{10^{34}}}$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $10^{10^{10^{34}}}$