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7 + 4 = 11 + 8 = 19 + 16 = 35the pattern seems to be to double the number that is added each time, thus the next term is35 + 32 =67and the one after that67 + 64 = 131
They are: 11, 13, 17 and 19
17+2 = 19
It is 17 because (17+19)/3 = 12
It is the same as: -9 +10 = 1