+1, +2, +4, +8
It doubles each time. The next number will be 35.
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67 The pattern is that the numbers increase by the next power of two 5 + 2^1 = 7 7 + 2^2 = 11 11 + 2^3 = 19 19 + 2^4 = 35
11/19 = 0.57895 (to 5 sf)
11
The numbers 5, 7, 11, 13, 17 and 19 are prime.
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