32
Other than the first two numbers, succesive numbers are formed by adding the two previous numbers and subtracting 1.
4 + 3 - 1 = 6
3 + 6 - 1 = 8
6 + 8 - 1 = 13
8 + 13 - 1 = 20
13 + 20 - 1 = 32
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17 cause it is the next prime number
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13/20 - 3/5 = 13/20 - 12/20 = 1/20
18. 3+1=4, 4+2=6, 6+3=9, 9+4=13, 13+5=18.
Answer = 21 The next number is the previous 2 numbers added together