Exponential Factorial Article Index for
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Exponential Factorial




The first few exponential factorials are 1 , 2 , 9 , 262144, etc. . So, for example, 262144 is an exponential factorial since 262144 = 4^{3^{2^1}}. The exponential factorials grow much more quickly than regular Factorial s or even Hyperfactorial s. The exponential factorial of 5 is approximately 6.206069878660874 × 10183230.

The sum of the reciprocals of the exponential factorials is the Irrational Number 1.6111149258083767361111... .


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