The first six square numbers are 1, 4, 9, 16, 25, and 36:
1 x 1 = 1
2 x 2 = 4
3 x 3 = 9
4 x 4 = 16
5 x 5 = 25
6 x 6 = 36
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The first twenty square numbers are:1,49162536496481100121144169196225256289324361400
The sum of the first six positive numbers (1 to 6) is 21.
The first 5 square numbers are 1, 4, 9, 16, and 25.
The first six triangular numbers are : 1,3,6,10,15,21. However, sometimes the first triangular number is regarded as 0 (zero) so you then have 0,1,3,6,10,15 as the first six triangular numbers.
There are six perfect squares which are factors of 2000.