what is a triangular number ???? badly stuck ...
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A triangular number is the sum of the n natural numbers from 1 to n. The sequence of triangular numbers for n = 1, 2, 3... is: 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, ....
Hello, sportychick1912! What is a triangular number? They arise from triangular arrays of objects. Code: o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o 1 3 6 10 15 And we have: . .
o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o 1 3 6 10 15
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