In a sequence of numbers, each number after the first two is the sum of the previous two numbers. If the first two numbers are 1 and 3, what is the seventh number in the sequence?
This is a Fibonacci-like sequence with different starting numbers. Let's generate the sequence step by step:

1. First number: 1
2. Second number: 3
3. Third number: 1 + 3 = 4
4. Fourth number: 3 + 4 = 7
5. Fifth number: 4 + 7 = 11
6. Sixth number: 7 + 11 = 18
7. Seventh number: 11 + 18 = 29

Final answer: The seventh number in the sequence is 29.