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.
1, 3, 6, 10, 15, 21
The sum of the first six positive numbers (1 to 6) is 21.
Triangluar numbers or triangle numbers are numbers formed from the summation of all the numbers smaller than them. The first few triangle numbers are 1,3,6,10,15,21... If you think of a pyramid with a base of two blocks, and one on top, there are three blocks. If you add a base of three to that pyramid, you have six blocks. Then ten, and fifteen and so on. That is why they are called Triangle numbers.
1, 2, 3, 4, 5 & 6.
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.
1, 3, 6, 10, 15, 21
The first six triangular numbers are 1, 3, 6, 10, 15 and 21.
6 is a triangular number, but 9 is not.
Six.
The sum of the first six odd numbers is 36.
The sum of the first six positive numbers (1 to 6) is 21.
The sum of the first six counting numbers (1-6) is 19.
The first six prime numbers:- 2, 3, 5, 7, 11 and 13
A triangular prism has six vertices. A triangular pyramid has four vertices.
Triangluar numbers or triangle numbers are numbers formed from the summation of all the numbers smaller than them. The first few triangle numbers are 1,3,6,10,15,21... If you think of a pyramid with a base of two blocks, and one on top, there are three blocks. If you add a base of three to that pyramid, you have six blocks. Then ten, and fifteen and so on. That is why they are called Triangle numbers.
There aren't just 6 triangular numbers. Triangular numbers are the result of adding the next number N to the last term of the sequence.For example:(If you start with 0)The numbers are:00+1=11+2=33+3=66+4=1010+5=1515+6=2121+7=28Etc.For finding the nth term, use the formula N(N+1)/2The first six are (as mentioned above), 1, 3, 6, 10, 15, 21.Note: Some may consider 0 as the first one, in which case the first six would be 0, 1, 3, 6, 10, 15.