1, 3, 6, 10, 15, 21, 28, 36, 45, 55.
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1'3'10 etc;
None. There is nobody to whom triangular numbers belong.
64 = 28 + 36
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.