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13 10 17 15 21

13 - 10 = -3

10 - 17 = +7

17 - 15 = -2

15 - 21 = +6

The negative numbers alternate with the positive numbers

The negative numbers are augmented by +1 each step

The positive numbers are diminished by -1 each sterp

So the next step from 21 is a negative and should be -2 increased by +1 to -1 giving a new value of 20

Then the next step is a positive and should be +6 decreased by -1 to +5 giving 25

13 - 10 = -3

10 - 17 = +7

17 - 15 = -2

15 - 21 = +6

21 - 20 = -1

20 - 25 = +5

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