What is the next number of the following sequence
8,8,15,23,39.....  Pick:
A) 44	B) 54	C) 64	D) 74	E) 68
8,8,15,23,39, x     8 + 8= 
<gadget id="calculator">  8 + 8</gadget>
<output>16</output>
16==&gt; 16 - 1= 
<gadget id="calculator">16 - 1</gadget>
<output>15</output>
15   8 + 15= 
<gadget id="calculator">8 + 15</gadget>
<output>23</output>
23==&gt; 23 + 0= 
<gadget id="calculator">23 + 0</gadget>
<output>23</output>
23   15 + 23= 
<gadget id="calculator">15 + 23</gadget>
<output>38</output>
38=&gt; 38 + 1= 
<gadget id="calculator">38 + 1</gadget>
<output>39</output>
39   23 + 39= 
<gadget id="calculator">23 + 39</gadget>
<output>62</output>
62=&gt; 62 + 2= 
<gadget id="calculator">62 + 2</gadget>
<output>64</output>
64   ANSWER:64
<result>C</result>
What is the next number of the following sequence
8,8,15,23,39.....