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The first two triangle numbers are 3 and 6.

[Unless you start with 1 as the first.]

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12y ago

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What are the first 6 triangle numbers?

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.


Which numbers are both triangular and square?

The numbers that are both triangular and square are known as "triangular square numbers." The first few of these numbers are 1, 36, and 1225. They can be generated by solving the equation ( n(n + 1)/2 = m^2 ) for positive integers ( n ) and ( m ). The general formula for finding these numbers involves using the Pell's equation related to the sequence of triangular numbers.


What happens when you add 2 consecutive triangular numbers?

When you add two consecutive triangular numbers, the result is a perfect square. For example, the first two triangular numbers are 1 (T1) and 3 (T2), and their sum is 4, which is (2^2). In general, the sum of the (n)-th triangular number (T_n) and the ((n+1))-th triangular number (T_{n+1}) equals ((n+1)^2). This relationship holds for all pairs of consecutive triangular numbers.


What are the first 5 triangular numbers?

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.


What are the 2 triangular numbers?

1000 and 2


How Are Triangular And Cubed Numbers Linked?

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


What triangular numbers are greater than 20?

Triangular numbers are generated by the formula ( T_n = \frac{n(n+1)}{2} ). The triangular numbers greater than 20 are 21, 28, 36, 45, and so on. Specifically, the first few triangular numbers greater than 20 are ( T_6 = 21 ), ( T_7 = 28 ), ( T_8 = 36 ), and ( T_9 = 45 ).


What are the first 5857 triangular numbers?

the numbers betwenn 1 and 365222


First six triangular numbers?

8,9,5,7,2 and 1


What is the sum of the first five triangular numbers?

It is 46.


How can sixth triangular number be 21?

Because it is ! The first 10 triangular numbers are... 1,3,6,10,15,21,28,36,45 & 55


What are the first ten triangular numbers?

The first ten triangular numbers are calculated by the formula ( T_n = \frac{n(n + 1)}{2} ), where ( n ) is a positive integer. The first ten triangular numbers are 1, 3, 6, 10, 15, 21, 28, 36, 45, and 55. Each number represents the total number of dots that can form an equilateral triangle with that many rows.