Triangular Number Calculator
Calculate the nth triangular number.
55
Formula
Tₙ = n × (n + 1) ÷ 2 — the sum of all integers from 1 to n.
Frequently Asked Questions
What is the Triangular Number T(10)?
55.
Calculate the nth triangular number.
Tₙ = n × (n + 1) ÷ 2 — the sum of all integers from 1 to n.
55.