parmenides51 13.09.2020 18:57 Prove that $2014$ divides $53n^{55}- 57n^{53} + 4n$ for all integer $n$.
Prod55 14.09.2020 20:27 $2014=2\cdot19\cdot 3$ $53n^{55}-57n^{53}+4n\equiv 53n-57n\equiv 0\pmod 2$ $53n^{55}-57n^{53}+4n\equiv 15(n^{19})^2\cdot n^{17}-0\cdot n^{53}+4n\equiv 15n^{17}+4n\equiv 19n\equiv 0\pmod {19}$ $53n^{55}-57n^{53}+4n\equiv 0\cdot n^{55}-4n^{53}+4n\equiv -4n+4n\equiv 0\pmod{ 53}$ etc