1. J. Brillhart, "Some miscellaneous factorizations," Math. Comp., v. 17, 1963, pp. 447– 450.
2. Concerning the numbers 2^{2𝑝}+1, 𝑝 prime;Brillhart, John;Math. Comp.,1962
3. A. J. C. Cunningham & H. J. Woodall, Factorizations of (𝑦ⁿ∓1), Hodgson, London, 1925.
4. E. Gabard, "Factorisation d’un nouveau nombre de Mersenne," Mathesis, 1959, p. 61.
5. Divisibility of terms by their subscripts in sequences of sums of powers;Jarden, Dov;Riveon Lematematika,1958