Mulatu, Lemma, Noel Mengistie, and Samera Mulatu. “Note on the Fascinating Fermat Numbers”. IJRDO -JOURNAL OF MATHEMATICS 4, no. 1 (January 31, 2018): 01-05. Accessed April 4, 2025. http://13.234.104.160/index.php/m/article/view/1694.