Přirozená čísla ve čtvercové síti
Rozhledy matematicko-fyzikální, Tome 87 (2012) no. 4, pp. 30-32
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The article deals with a sum of $n$ natural numbers which are selected by a given rule from square grid with numbers $1, 2, 3,\ldots n^2$. The formula for this sum is derived.
The article deals with a sum of $n$ natural numbers which are selected by a given rule from square grid with numbers $1, 2, 3,\ldots n^2$. The formula for this sum is derived.