What is the next number in the sequence : 13,17,25,32,37,47,58,71__?  Choose the correct choice from the following choices:  A) 78  B) 79  C) 71  D) 76  E) 73
next no. = previous + (sum of digits)   13 + (1+3)= 
<gadget id="calculator">13 + (1+3)</gadget>
<output>17</output>
17   17 + (1+7)= 
<gadget id="calculator">17 + (1+7)</gadget>
<output>25</output>
25   25 + (2+5)= 
<gadget id="calculator">25 + (2+5)</gadget>
<output>32</output>
32   32 + (3+2)= 
<gadget id="calculator">32 + (3+2)</gadget>
<output>37</output>
37   37 + (3+7)= 
<gadget id="calculator">37 + (3+7)</gadget>
<output>47</output>
47   47 + (4+7)= 
<gadget id="calculator">47 + (4+7)</gadget>
<output>58</output>
58   58 +(5+8)= 
<gadget id="calculator">58 +(5+8)</gadget>
<output>71</output>
71   71 + (7+1)= 
<gadget id="calculator">71 + (7+1)</gadget>
<output>79</output>
79   ANSWER:79
<result>B</result>
What is the next number in the sequence : 13,17,25,32,37,47,58,71__?