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That's the Triangular Number sequence: the sequence of sums of the numbers 1 to n, with n representing the position in the sequence.
It can be expressed in mathematical notation in two ways.
First, in strict algebra, T(n) = (n^2 + n)/2
Then, as a binomial coefficient: (n + 1) C 2
(Sorry, but formatting options are limited here.)
You can find out more about the Triangular Numbers by looking up A000217 in the Online Encyclopedia of Integer Sequences or by studying the "Handshake Problem".
What else can I help you with?
Which number is the next logical number in the following sequence of numbers 5 10 15 10?
5+5 = 10 10+5 = 15 15-5 = 15 10+5 = 15
What number is next in this sequence 10 4 3 11 15?
14
What is the nth term of the sequence 15 25 35 45 55?
15(1)
What is the next number in the sequence 5-10-15- 10?
there is not much of a pattern there but i would say 45
What number comes next in sequence 1 3 6 10 15 21 28?
35
Which number is the next logical number in the following sequence of numbers 5 10 15 10?
5+5 = 10 10+5 = 15 15-5 = 15 10+5 = 15
What is next logical number in sequence of 5 10 15 10?
5
Which number comes in the next sequence 5 10 15 10?
5
What number is the next logical number in the following sequence of numbers 5 10 15 10?
5
Which number is next in line sequence 5 10 15 10?
the answer should be 5
What is the number which best completes the sequence 10 30 15 16 48 24 25?
75The number which best completes the sequence 10 30 15 16 48 24 25 is 75.
What number is next in this sequence 10 4 3 11 15?
14
What is the next number in a sequence 60 30 20 15 12?
10 The sequence is given by xn = 60/n
What is the Answer to this number sequence 60 30 20 15 12?
10. (Don't ask why.)
Next number in sequence 10 30 15 16 48 24?
25
What is the next number in the sequence 1 3 6 10 15 21?
28
What is the nth term of the sequence 15 25 35 45 55?
15(1)
