Joey needs to take a new prescription. The first day he needs to take one pill. Each day he must take two more pills than the previous day. How many pills will he take in a week?
For the second day he takes 1 + 2 = 
<gadget id="calculator">1+2</gadget>
<output>3</output>
3 pills.
For the third day he takes 3 + 2 = 
<gadget id="calculator">3+2</gadget>
<output>5</output>
5 pills.
For the fourth day he takes 5 + 2 = 
<gadget id="calculator">5+2</gadget>
<output>7</output>
7 pills.
For the fifth day he takes 7 + 2 = 
<gadget id="calculator">7+2</gadget>
<output>9</output>
9 pills.
For the sixth day he takes 9 + 2 = 
<gadget id="calculator">9+2</gadget>
<output>11</output>
11 pills.
For the seventh day he takes 11 + 2 = 
<gadget id="calculator">11+2</gadget>
<output>13</output>
13 pills.
For the entire week he takes a total of 1 + 3 + 5 + 7 + 9 + 11 + 13 = 
<gadget id="calculator">1+3+5+7+9+11+13</gadget>
<output>49</output>
49 pills.

<result>49</result>