Normenyo, B., S. Rihane, and A. Togbe. “Fermat and Mersenne Numbers in $k$-Pell Sequence”. Matematychni Studii 56, no. 2 (December 26, 2021): 115-123. Accessed April 4, 2025. http://matstud.org.ua/ojs/index.php/matstud/article/view/251.