It is 43 because 31+12 = 43
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If you mean: 1 1 2 3 5 8 13 21 then the next number is 13+21 = 34
The next number will be 13+21 = 34
13 & 21
34 55 89 etc..
5-8-13-21-34-56-90.... The next number is the sum of the two previous numbers. This is the Fibonacci sequence, 1-1-2-3-5-8-13-21-34-56-90 etc