1. R. C. Archibald, Mersenne’s numbers, Scripta Mathematica vol. 3 (1935) pp. 112-119.
2. Proof that the Mersenne number 𝑀₁₆₇ is composite;Barker, Charles B.;Bull. Amer. Math. Soc.,1945
3. E. Fauquembergue, Nombres de Mersenne, Sphinx-Œdipe, vol. 9 (1914) pp. 103-105; vol. 15 (1920) pp. 17-18.
4. On the factorization of 2ⁿ±1;Kraitchik, Maurice;Scripta Math.,1952
5. D. H. Lehmer, Note on the Mersenne number 2¹³⁹-1, Bull. Amer. Math. Soc. vol. 32 (1926) p. 522