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KöMaL 2024 A872

    For every positive integer kk let ak,1,ak,2,…a_{k,1},a_{k,2},\ldots be a sequence of positive integers. For every positive integer kk let sequence {ak+1,i}\{a_{k+1, i}\} be the difference sequence of {ak,i}\{a_{k, i}\}, i.e. for all positive integers kk and ii the following holds: ak,i+1−ak,i=ak+1,ia_{k, i+1}-a_{k, i}=a_{k+1, i}. Is it possible that every positive integer appears exactly once among numbers ak,ia_{k,i}?

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