Let k ≥ 1 denote any positive rational integer. We give formulae for the sums (where χ ranges over the ϕ(f)/2 odd Dirichlet characters modulo f > 2) whenever k ≥ 1 is odd, and for the sums (where χ ranges over the ϕ(f)/2 even Dirichlet characters modulo f>2) whenever k ≥ 1 is even.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-cm90-1-6, author = {St\'ephane Louboutin}, title = {The mean value of |L(k,$\chi$)|$^2$ at positive rational integers k $\geq$ 1}, journal = {Colloquium Mathematicae}, volume = {89}, year = {2001}, pages = {69-76}, zbl = {1013.11049}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm90-1-6} }
Stéphane Louboutin. The mean value of |L(k,χ)|² at positive rational integers k ≥ 1. Colloquium Mathematicae, Tome 89 (2001) pp. 69-76. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm90-1-6/