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Thre are infinitely many solutions.

The smalest set with two different triangular number adding to another is

6 + 15 = 21

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Q: What triangular numbers are equal to the sum of two other triangular numbers?
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Related questions

The smaller of two triangular numbers whose sum and difference are also triangular numbers?

the answer is of course 12


How Are Triangular And Cubed Numbers Linked?

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


What is the sum of the first five triangular numbers?

It is 46.


When you add two triangular numbers why do they equal to a square number?

They don't necesarily,3 is a triangular number and 10 is a triangular number. Their sum is 13 which is not a square number.They don't necesarily,3 is a triangular number and 10 is a triangular number. Their sum is 13 which is not a square number.They don't necesarily,3 is a triangular number and 10 is a triangular number. Their sum is 13 which is not a square number.They don't necesarily,3 is a triangular number and 10 is a triangular number. Their sum is 13 which is not a square number.


What is the answer to the sum of the first 100 triangular numbers?

171700


How many triangular numbers are also square numbers?

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.


What is triangular inequality of complex number?

The absolute value of the sum of two complex numbers is less than or equal to the sum of their absolute values.


Is the absolute value of the sum of two numbers equal to the sum of the absolute values of the numbers?

NO! abs(2-2)=0 NOT equal to abs(2)+abs(-2)=4 - The above is technically correct, though the more thorough answer is as follows; no because the absolute value of the sum is LESS THEN OR EQUAL TO the sum of the absolute values. The simple proof the the fact that |A+B|<=|A|+|B| is called the triangular inequality. When A and B (or for that matter an infinite number of them) are both positive (or all) or both negative (or all) then they inequality is actually equal, if however any of the numbers have different signs then any other number, the inequality is less then.


What are the connection between triangular numbers and square numbers?

One relationship is that the sum of the nth and the previous triangular numbers is equal to the nth square number.That isT(n-1) + T(n) = S(n)where T(n) is the nth triangular number and S(n) is the nth square number.


What is the sum of two prime numbers that equal 44?

I assume you are asking the question "what two prime numbers sum to 44". There may be other pairs of prime numbers that sum to 44, but 37 and 7 are both primes and their sum = 44.


Smaller of two triangular numbers whose sum and difference are also triangular numbers?

The answer would be 15 and 21. The triangular numbers are 1,3,6,10,15,21,28,36,45,55,66,78. 15 plus 21 is 36 which is on the list. 21 minus 15 is 6 and that is on the list as well.


What is the sum of the first four triangular numbers?

1+3+6+10 =20