The next number is 27. The numbers are in pairs. The lower number is subtracted from the higher and makes an incremental series 7, 8, 9 and you have to find the next pair to make the increment of 10. So you are looking for a number 10 higher than 17; which is 27.
9-2=7, 13-5=8, 19-10=9 and 27-17=10
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3 + 4 +10 = 17 is a number sentence that has a sum of 17. 4 + 13 = 17 is also a number sentence that has a sum of 17. Here are some more number sentences: 10 + 10 - 3 = 17 21 - 4 = 17 There are many ways to write a number sentence that has a sum of 17. What other ways can you think of?
If you mean: 2 3 5 7 11 13 and 17 then the next number is 19 because they are all prime numbers
The whole number between 13 and 17 is 15
The next number in the sequence is 27.
They are: 11 13 17 19 23 and 29 which makes six of them