What is the triangle number of 13?

Answer 1

The triangle number of 13 can be calculated using the formula n(n+1)/2, where n is the number you are finding the triangle number of. In this case, n is 13. Plugging 13 into the formula, we get 13(13+1)/2 = 13(14)/2 = 182/2 = 91. Therefore, the triangle number of 13 is 91.

Answer 2

13 is not a triangle number. The 13th triangle number is 91.

Answer 3

The 13th triangular number is 13*14/2 = 91.