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2. Burton, David M (1976) Elementary number theory. Boston: Allyn and Bacon.
3. Calinger, Ronald S. (2016) Leonhard Euler: Mathematical Genius in the Enlightenment. Princeton.
4. Chabert, Jean-Luc (1999) A History of Algorithms. From the Pebble to the Microchip. Springer.
5. E26. Euler, L., Observationes de theoremate quodam Fermatiano aliisque ad numeros primos spectantibus (Observations on a theorem of Fermat and others on looking at prime numbers). Commentarii academiae scientiarum Petropolitanae, 6, 1738, 103–107. Reprinted Opera Omnia, Series 1, Volume 2, 1–5. There are two English translation on the Euler Archive, one by Jordan Bell, the other by David Zhao.