<?php
include_once __DIR__ . '/app/Mage.php';
Mage::app('admin');


//Getting all prdoucts collection
$collection = Mage::getResourceModel('productslider/product_collection')
                ->addAttributeToSelect('*');


foreach($collection as $prod){
    $prodId = $prod->getId();
    $_product = Mage::getModel('catalog/product')->load($prodId);
    $categoryIds = $_product->getCategoryIds();
    if(count($categoryIds) == 0){
        //Delete prdouct
        //$_product->delete();
        echo $prodId;
    }
}