Creating multiple pages

post_parent must be a single number, not an array. Each post can have only one parent. If you want to insert posts for multiple parents, use something like this:

foreach ( array(17, 25, 27, 29) as $parent )
{
    wp_insert_post (
        array(
            'post_title'  => $something,
            'post_type'   => 'page',
            'post_author' => 1,
            'post_status' => 'publish',
            'post_parent' => $parent
        )
    );
}