What is missing number term in the given series? 3, 7, 13, ?, 31

19 20 21 23

21

3, 7, 13, ?, 31 3, 3+(2×2)=7, 7+(2×3)=13, 13+(2×4)=21, 21+(2×5)=31 The correct answer is Option (3) → 21