Look for the pattern in the sequence of numbers. What number is missing? You can use a calculator to help. $$ 1, \ldots, 7,10,13,16, \ldots $$

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1. The given sequence is  
   $$
   1,\ \ldots,\ 7,\ 10,\ 13,\ 16,\ \ldots
   $$

2. Notice that from 7 onward, the numbers increase by a constant difference. Calculate the difference:  
   $$
   10 - 7 = 3,\quad 13 - 10 = 3,\quad 16 - 13 = 3.
   $$

3. This indicates that the sequence is an arithmetic progression with a common difference of $$3$$.

4. To maintain the same pattern from the beginning, the term before $$7$$ (i.e., replacing the missing term) should also be $$3$$ less than $$7$$:  
   $$
   7 - 3 = 4.
   $$

5. Therefore, the missing number is  
   $$
   4.
   $$
The missing number is 4.

Look for the pattern in the sequence of numbers. What number is missing? You can use a calculator to help. \( 1, \ldots, 7,10,13,16, \ldots \)

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