The nth triangular number is given by:
Tn = n(n + 1)/2
→ T{14} = 14(14 + 1)/2 = 105
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the fourteenth prime number is 43.
Is 63 a triangular number I think it is a triangular number.
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No, 18 is not a triangular number.
No, 35 is not a triangular number.