TRIANGULAR NUMBER


Meaning of TRIANGULAR NUMBER in English

noun Date: 1795 a number (as 3, 6, 10, 15) representable by that many dots arranged in rows that form a triangle and that equals n(n + 1)/2 for some positive integer value of n

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.