Q: How do you get triangular numbers?

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None. There is nobody to whom triangular numbers belong.

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

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

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

Yes, the number 21 is indeed a triangular number. Other triangular numbers are 6,10, and 15.

Related questions

None. There is nobody to whom triangular numbers belong.

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.

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.

6 is a triangular number, but 9 is not.

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

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.