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The 50th triangular number is (50)(51)/2=1275
List of triangular numbers 1,3,6,... work out the rest
Oh, dude, it's like super simple. The 50th triangular number is just the sum of all the numbers from 1 to 50. So, you can use the formula n(n+1)/2, where n is 50 in this case. Plug it in, do the math, and boom, you've got your answer. It's like math, but with a little extra pizzazz.
Is 63 a triangular number I think it is a triangular number.
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