1, 3, 6, 10, 15, 21
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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.
8,9,5,7,2 and 1
Triangle numbers or triangular numbers are those numbers that can form an equilateral triangle when counting the objects. The first five triangular numbers are: 1, 3, 6, 10, 15.
It is 46.
No. The first few triangular numbers are 1, 3, 6, 10, 15, 21, 28, ...