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This is the sequence of triangular numbers. You draw one dot. Then you draw two dots in the line below - one to the left and one to the right of the first dot. You now have a triangle, of three dots. Then you draw three dots in the next line and you get a triangle with 6 dots. Next, four more dots in the next line giving a triangle with 10 dots. The name is easy to understand if you can visualise or even actually draw these dots. It is difficult to demonstrate through an ordinary word processing package.
What else can I help you with?
What number comes next in sequence 1 3 6 10 15 21 28?
35
The sequence name for 1 1 2 3 5 8 13 21?
Fibonacci Sequence
What is this sequence called 1 3 5 7 9 11 13 15?
They are a sequence of odd numbers. The next three in the sequence would be 17,19 & 21
The first 6 triangular numbers are?
1, 3, 6, 10, 15 ,21 The nth term for the sequence (where you replace n with the term you want to find) is: (n(n+1))/2
What are two ratios that are equivilent to 5 over 7?
5:7 (or 5/7) is equivalent to 10:14 (10/14) and 15:21 (15/21).
What is the name of the numerical sequence 1 3 6 10?
Assuming it continues 15, 21, 28, ... then it is the triangular numbers.
What is the next number in the sequence 1 3 6 10 15 21?
28
What is the missing number 10 15 28?
To find the missing number in the sequence 10, 15, 28, we can look for a pattern in the differences between the numbers. The difference between 10 and 15 is 5, and the difference between 15 and 28 is 13. If we assume a pattern in the differences, the missing number could be 21, which fits as the average of 15 and 28. Thus, the sequence could be 10, 15, 21, 28.
What number comes next in sequence 1 3 6 10 15 21 28?
35
What is the next number in the sequence 3-15-6-30-21?
The next number in the sequence 3-15-6-30-21 is -207.
Next number in sequence 10 8 7 14 15 13 12 24 25?
21
Is 36 a trangular number?
Yes it is. In sequence from 1, the first 10 triangular numbers are... 1, 3, 6, 10, 15, 21, 28, 36, 45 & 55.
What is 5 over 7 minus 5 over 21?
5/7 - 5/21 = 15/21 - 5/21 = 10/215/7 - 5/21 = 15/21 - 5/21 = 10/215/7 - 5/21 = 15/21 - 5/21 = 10/215/7 - 5/21 = 15/21 - 5/21 = 10/21
What is the next number in the following sequence 1361015?
I'm guessing your sequence is 1, 3, 6, 10, 15, ... In which case it continues: 21, 28, 36, 45, 55, 66, ... (These are the triangular numbers.)
What are the six smallest keys that you can create by multiplying two different prime numbers?
They are 6, 10, 14, 15, 21, 22.They are 6, 10, 14, 15, 21, 22.They are 6, 10, 14, 15, 21, 22.They are 6, 10, 14, 15, 21, 22.
What is the next number in the following sequence 16 26 21 31?
26 As far as I can tell the sequence is +10,-5,+10,-5.
What is the missing number 13 10 17 15 21 25 25?
This sequence is an interlace of two sequences: 13,17,21,25,29,33,..(each number 4 higher than the previous one) and 10, 15, 25,30,35(each number 5 more than the previous one). So the sequence continues 30,29,35,33,...
