olymmath

OMM 2022 Problem 5

    Let n>1n>1 be a positive integer and d1<d2<⋯<dmd_1<d_2<\dots<d_m be its mm positive divisors, including 11 and nn . Lalo writes the following 2m2m numbers on a board: d1,d2…,dm,d1+d2,d2+d3,…,dm−1+dm,Nd_1,d_2\dots, d_m,d_1+d_2,d_2+d_3,\dots,d_{m-1}+d_m,N where NN is a positive integer. Afterwards, Lalo erases any number that is repeated (for example, if a number appears twice, he erases one of them). Finally, Lalo realizes that the numbers left on the board are exactly all the divisors of NN . Find all possible values that nn can take.

    Dataset text AI-MO AoPS. Quoted with source.

    Solutions

    No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.

    Add a solution

    Similar problems

    These problems have the most words in common with this statement.

    Locator mx-omm/2022/p5 · Tag N075TD7Q7D · Edit this page on GitHub · Keys: j next, k previous