In his "Adnotationes ad calculum integrale Euleri" (1790) he published a calculation of what is now known as the Euler–Mascheroni constant, usually denoted as γ (gamma).
В своей работе "Adnotationes ad calculum integrale Euleri" (1790) Маскерони вычислил 32 знака константы Эйлера и предложил её обозначение.