Bulk update sequential order number (https://wordpress.org/plugins/wt-woocommerce-sequential-order-numbers/)

functions.php

$temp= 'a';
add_filter('wt_alter_sequence_number','wt_change_seq_numbers',10,2);
function wt_change_seq_numbers ($sequence_number,$order_id)
{
	global $temp;
	if($order_id >= 130499 && $order_id <= 130501)
	{
		$sequence_number = '1500';
		$sequence_number = $sequence_number.$temp;
		update_post_meta($order_id, '_order_number', $sequence_number);
		$temp++;
	}
	return $sequence_number;
}