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WikiPedia: Quy tắc chia hết //books.google.com/books?id=BFtOuh5xGOwC&pg=PA101&... //books.google.com/books?id=HucyKYx0_WwC&pg=PA102&... //books.google.com/books?id=HucyKYx0_WwC&pg=PA102&... //books.google.com/books?id=Il64dZELHEIC&pg=PA108&... http://janetbmath.com http://www.math.hmc.edu/funfacts/ffiles/10005.5.sh... http://www.cut-the-knot.org/blue/divisibility.shtm... //dx.doi.org/10.1038%2Fscientificamerican0962-232 //www.jstor.org/stable/24936675 http://oeis.org/A333448