63 is the only composite number in that list.
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Only 63 is a composite. 63 = 3 x 3 x 7 The other three numbers (13, 31, 61) are all prime numbers.
The answer is 493
32. # 1 # 3 # 5 # 7 # 9 # 11 # 13 # 15 # 17 # 19 # 21 # 23 # 25 # 27 # 29 # 31 # 33 # 35 # 37 # 39 # 41 # 43 # 45 # 47 # 49 # 51 # 53 # 55 # 57 # 59 # 61 # 63
My guess is 65. I don't know what sequence the first, third numbers are but observing the others it is going 61...63.....65....67
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