Let S be the set of all positive integers that, when divided by 8, have a remainder of 5. What is the 81th number in this set?  Select the correct option.
A) 605 B) 608 C) 613 D) 616 E) 645
The set S = {5, 13, 21, 29, ..................... }   1st Number = 8 * 0 + 5= 
<gadget id="calculator">8 * 0 + 5</gadget>
<output>5</output>
5   2nd Number= 8 * 1 + 5= 
<gadget id="calculator">8 * 1 + 5</gadget>
<output>13</output>
13   3rd Number= 8 * 2 + 5= 
<gadget id="calculator">8 * 2 + 5</gadget>
<output>21</output>
21   81th Number= 8 * (81-1) + 5= 
<gadget id="calculator">8 * (81-1) + 5</gadget>
<output>645</output>
645   Answer= 645
<result>E</result>
Let S be the set of all positive integers that, when divided by 8, have a remainder of 5. What is the 81th number in this set?