Shields, Nicquala, and Mulatu Lemma. “Conquering Basic Properties of Even Perfect Numbers Using the Gun of Finite Series”. IJRDO -JOURNAL OF MATHEMATICS 3, no. 11 (November 30, 2017): 01-06. Accessed December 22, 2024. http://webdisk.ijrdo.org/index.php/m/article/view/1595.