2 9 5 13 10 19 17 27 26 37 37 49 50 ...
The sequence is composed of these two sub-sequences:
2 5 10 17 26 37 50 (+3,+5,+7,+9,+11,...)
9 13 19 27 37 49 (+4,+6,+8,+10,+12,...)
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27.
This is a peculiar number sequence which follows the following rule: +7, -4, +8, -3, +9, -2... The next few functions would be +10, -1, +11, -0 And thus the next few numbers in the sequence would be 17+10=27, 27-1=26, and so on. The sequence in total goes 2, 9, 5, 13, 10, 19, 17, 27, 26, 37, 37.
Look at the differences bettween the terms: 9-2=7, 5-9=-4, 13-5=8, 10-13=-3The differences finally are: 7,-4,8-3,9,-2. The next difference must be 10, so the next term is 27(27-17=10) and the next difference must be -1, so the next term must be 26(26-27=-1). Finally, the sequence is: 2 9 5 13 10 19 17 27 26 and so on.
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