Q: Which triangular numbers are also quarent 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.

You get a sequence of doubled triangular numbers. This sequence can also be represented by Un = n*(n + 1), [products of pairs of consecutive integers]

Yes. 36 is a triangular number, because it is 1+2+3+4+5+6+7+8, and it is also a square number, because 36=6x6. 1 is another square number that is traditionally considered to be triangular.

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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.

None. There is nobody to whom triangular numbers belong.

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.

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

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.

You get a sequence of doubled triangular numbers. This sequence can also be represented by Un = n*(n + 1), [products of pairs of consecutive integers]

Yes. 36 is a triangular number, because it is 1+2+3+4+5+6+7+8, and it is also a square number, because 36=6x6. 1 is another square number that is traditionally considered to be triangular.