1,3,6,10,15,21,28,36,45,55
1,2,3,4 ,5 ,6 ,7 ,8 ,9 ,10
1, 3, 6, 10, 15, 21, 28, 36, 45, 55.
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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.
No. The first few triangular numbers are 1, 3, 6, 10, 15, 21, 28, ...
1, 3, 6, 10, 15, 21
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.
6 and 10 are triangular numbers that make 16.