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triangular number meaning in Russian

EnglishRussian
triangular number (an integer which is the sum of n natural numbers)
noun
[UK: traɪ.ˈæŋ.ɡjʊ.lə(r) ˈnʌm.bə(r)]
[US: traˈjæŋ.ɡjə.lər ˈnʌm.br̩]

треугольное числоnoun
{n}