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1, the first triangular number, is also a square.
36 is the only square number that is also a triangular number between 20 and 40.
144 is a square number, not a triangular number.
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.
It is 13 squared, but it's not a triangular number