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The next number in this sequence is 18. You're adding 1 to the difference of the previous two numbers. 4-3=1, 6-4=2 etc... so 18-13=5.

The sequence is t(n) = 0.5*(n2 - n + 6) where n = 1, 2, 3, ...

It is, of course, easy to find polynomials of order 3 or higher that would fit the sequence.

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Q: What the sequence 3 4 6 9 13?
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Number sequence 3 4 6 9 13?

18 is the answer and here is why:- 3+1=4 4+2=6 6+3=9 9+4=13 13+5=18


3 4 6 9 13 complete the sequence?

18. The pattern is 3+1=4, 4+2=6, 6+3=9, 9+4=13, so 13+5=18


What is next in this sequence 3 4 6 9 13?

18


What is the number that best completes this sequence 3 4 6 9 13?

18 (3+1 4+2 6+3 9+4 13+5)


What number comes next in this number sequence 3 4 6 9 13?

18. 3+1=4, 4+2=6, 6+3=9, 9+4=13, 13+5=18.


What is the next number in this sequence 3 4 6 9 13?

The next number in the sequence is 18. It's +1, +2, +3, +4, ....


Which number completes sequence 3 4 6 9 13?

18


What is the next number sequence for 3 4 6 9 13?

18


What is the number that completes the sequence 3 4 6 9 13?

18


What comes next in the number sequence 3 4 6 9 13?

18


The number that best completes the sequence 3 4 6 9 13?

18


What number best completes the sequence below 3 4 6 9 13?

18 Add to previous number by 1 then 2 then 3 then 4 and 5 3+1=4 4+2=6 6+3=9 9+4=13 so then 13+5=18