Best Answer

The triangular numbers are

1, 3, 6, 10, 15, ...

and are calculated as:

t1 = 1

t2 = 1 + 2

t3 = 1 + 2 + 3

tn = 1 + 2 + ... + n

The formula for the sum tn = 1 + 2 + ... + n is:

tn = n(n+1)/2

Q: How do you work out triangular numbers?

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Triangle numbers or triangular numbers are those numbers that can form an equilateral triangle when counting the objects. The first five triangular numbers are: 1, 3, 6, 10, 15.

6 and 10 are triangular numbers that make 16.

the answer is of course 12

There are an many triangular numbers that are also square numbers. Simply put, the sum of two consecutive triangular number equals a square number. Examples include 1 and 36.

The first six triangular numbers are : 1,3,6,10,15,21. However, sometimes the first triangular number is regarded as 0 (zero) so you then have 0,1,3,6,10,15 as the first six triangular numbers.

Related questions

None. There is nobody to whom triangular numbers belong.

List of triangular numbers 1,3,6,... work out the rest

Triangle numbers or triangular numbers are those numbers that can form an equilateral triangle when counting the objects. The first five triangular numbers are: 1, 3, 6, 10, 15.

6 and 10 are triangular numbers that make 16.

Nope Triangular numbers are 1,3,6,10,15,21,28,36

1,36,1225,41616,1413721

the answer is of course 12

You cannot convert even numbers to triangular numbers! There is no such relationship.

No, 39 is not a triangular number. The closet triangular numbers are 36 and 45.

6 is a triangular number, but 9 is not.

There are an many triangular numbers that are also square numbers. Simply put, the sum of two consecutive triangular number equals a square number. Examples include 1 and 36.

The sum of the first n cubed numbers is the square of the nth triangular number.