Hi Mike,
thanks for your help.
I am sharing my solution because yours wasn’t complete:

function custom_pagination_slider_script(){
?>
<script>
(function($){
	$(document).ready(function() {
		var thispag = $( ".pagination-wrap.pagination-slider nav.pagination a" );
		var thisfirst = $( ".pagination-wrap.pagination-slider nav.pagination a" ).eq(0);
		var thisone = $( ".pagination-wrap.pagination-slider nav.pagination a" ).eq(1);
		var count = thispag.length;
		var baseurl = location.protocol + '//' + location.host + location.pathname;
		var url = document.URL;
		var theURL = url.split( "=" )[0];
		var theindex = url.split( "=" )[1];

		if ( count > 0 ) {
			if ( theindex == 1 ) {
				thispag.attr( "href", baseurl );
			} else if ( theindex > 1 && count < 5 ) {
				thisfirst.attr( "href", baseurl );
			} else if ( theindex == 2 && count > 4 ) {
				thisfirst.attr( "href", baseurl );
				thisone.attr( "href", baseurl );
			} else if ( theindex == 3 && count > 4 ) {
				thisfirst.attr( "href", theURL + "=" + ( theindex - 1 ) );
				thisone.attr( "href", baseurl );
			} else if ( theindex > 3 && count > 4 ) {
				thisfirst.attr( "href", baseurl );
				thisone.attr( "href", theURL + "=" + ( theindex - 1 ) );
			}
		}
	});
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'custom_pagination_slider_script');

I hope it could help someone.
Regards,
Dario