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They do not exist since there is no such word as triangula.

Triangular numbers, on the other hand, are numbers that form the sequence

1, 1+2, 1+2+3, 1+2+3+4 and so on.

The nth term of this sequence, 1, 3, 6, 10, ... is generated by the rule

Un = n*(n+1)/2 where n = 1, 2, 3, ...

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Q: What are triangula numbers?
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