| "Because some years previously in 1886 when occupied with the problem
of the quadrature of the circle he had learned of the existence of a
number computed to a relative degree of accuracy to be of such
magnitude and of so many places, e.g. the 9th power of the 9th power
of 9, that, the result having been obtained, 33 closely printed volumes
of 1000 pages each of innumerable quires and reams of India paper would
have to be requisitioned in order to contain the complete tale of its
printed integers of units, tens, hundreds, thousands, tens of
thousands, hundreds of thousands, millions, tens of millions, hundreds
of millions, billions, the nucleus of the nebula of every digit of
every series containing succinctly the potentiality of being raised
to the utmost kinetic elaboration of any power of any of its powers".
James Joyce, Ulysses, Chapter 17.
a(2)=2 since 2^(2^2)=2^4=16 has 2 digits. - Carmine Suriano, Feb 01 2011
a(0)=1 because 0^(0^0)=0^1=0, which has 1 digit. - T. D. Noe, Feb 01 2011
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