1. M. BEELER, R. W. GOSPER & R. SCHROEPPEL, Artificial Intelligence Memo 239, MIT, Artificial Intelligence Laboratory, 1972, p. 13.
2. Concerning the numbers 2^{2𝑝}+1, 𝑝 prime;Brillhart, John;Math. Comp.,1962
3. J. BRILLHART, "Some miscellaneous factorizations," Math. Comp., v. 17, 1963, pp. 447-450.
4. Some factorizations of 2ⁿ±1 and related results;Brillhart, John;Math. Comp. 21 (1967), 87-96; corrigendum, ibid.,1967
5. M. KRAITCHIK, Théorie des Nombres, vol. 2, Gauthier-Villars, Paris, 1926, p. 135.