Euler constants for a Fuchsian group of the first kind Muharem Avdispahić, Lejla Smajlović (2008) Acta Arithmetica
Explicit estimates for the summatory function of Λ(n)/n from the one of Λ(n) Olivier Ramaré (2013) Acta Arithmetica We prove that the error term ∑ n ≤ x Λ ( n ) / n - l o g x + γ differs from (ψ(x)-x)/x by a well controlled function. We deduce very precise numerical results from the formula obtained.