0,1,3,6,10,15,21,28,36,45,56,68,81,95,110,126,143,161,180,200. That's all the triangular numbers up to 200! I hope that's helped anyone with any thing.
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1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400 All the square numbers up to 20!
1,3,6,10,15,21,28,36,45,47,66,78,91,95
45
1, 3, 6, 10, 15, 21, 28, 36
There are exactly 200 of them.