in my experience there is no specific list of the number of the vertex in the obj file.  it's simply implied in the order that it is listed.  i use crimson editor to check which number each vert line refers to.

or you could copy only the v lines to a text file and open in a spreadsheet to find line numbers.

 

usually when i create an obj in blender, the only data that comes out is v lines and f lines, the v that is the vert index and f tells which verts join in what order to make the faces.  other data is generated by poser.

 

i'm gonna head over to the python area and ask for this script.

go that way really fast.
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