[eluser]Samus[/eluser]
Change your config back to the first one and try the URL with siteurl/index/2
The pagination is expecting yor 2nd parameter to be the segment in used in displaying pagination results.
In your case the first parameter is the pagination segment.
If you want the following URL siteurl.com/2 your $config['uri_segment'] should be set to the first parameter i.e $config['uri_segment'] = 1.
It's more practical to use the third or second parameter in your apps, so either link it to siteurl.com/index/2 or use a different function for your pagination