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KöMaL 2022 A830

    For H⊂ZH\subset \mathbb{Z} and n∈Zn\in \mathbb{Z}, let hnh_n denote the number of finite subsets of HH in which the sum of the elements is nn. Does there exist H⊂ZH\subset \mathbb{Z}, for which 0∉H0\notin H, and hnh_n is a (finite) even number for every n∈Zn\in \mathbb{Z}? (The sum of the elements of the empty set is 0.)

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