  We believe that Euler constant is not just the "renormalized" value of the
Riemann zeta function in 1. In a sense that we shall clarify it is in fact the
normal and natural value of zeta of 1. In this paper we first propose a limit
definition of a function whose values coincide everywhere with those of the
Riemann zeta function, save in 1, where our limit definition yields the Euler
constant. Since in the literature one can find more than one way to regularize
the value of the zeta function at s=1, we give asymptotic expansions where, by
dint of some extended analogies, Euler constant appears to be the true
"renormalized" value. As a striking example of such analogies, we propose an
expansion of the logarithm function based on Euler constant and on all values
of the zeta function at odd positive integers, in which all these presumably
irrational numbers are accompanied by Harmonic numbers of corresponding orders.
The other aim of this paper is to show how sequences of rationals, often the
same, arise in computations related to Dirichlet L-functions. Here, a
connection with the Liouville lambda function appears to have been found. Thus
we raise the question about the possible usefulness of an extension of the
Liouville lambda function to rationals. .
