Amato, Gianluca; Hasler, Maximilian; Melfi, Giuseppe; Parton, Maurizio (2019). “Primitive abundant and weird numbers with many prime factors”. Journal of Number Theory. Elsevier. 201: 436–459. arXiv:1802.07178. doi:10.1016/j.jnt.2019.02.027.
doi.org
Benkoski, Stan (1972). “E2308 (in Problems and Solutions)”. The American Mathematical Monthly. 79 (7): 774. doi:10.2307/2316276. JSTOR2316276.
Amato, Gianluca; Hasler, Maximilian; Melfi, Giuseppe; Parton, Maurizio (2019). “Primitive abundant and weird numbers with many prime factors”. Journal of Number Theory. Elsevier. 201: 436–459. arXiv:1802.07178. doi:10.1016/j.jnt.2019.02.027.
jstor.org
Benkoski, Stan (1972). “E2308 (in Problems and Solutions)”. The American Mathematical Monthly. 79 (7): 774. doi:10.2307/2316276. JSTOR2316276.
Sándor, József; Mitrinović, Dragoslav S.; Crstici, Borislav biên tập (2006). Handbook of number theory I. Dordrecht: Springer-Verlag. tr. 113–114. ISBN1-4020-4215-9. Zbl1151.11300.