It doesn't follow the pattern.
1 + 2 + 3 + 4 + 5 + 6 = 21
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No.
The 20th triangular number is 20*21/2 = 210
36 is the only square number that is also a triangular number between 20 and 40.
Is 63 a triangular number I think it is a triangular number.
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