400. That’s an error.

Google cannot redirect you to http://www.target.com/p/the-mathematical-century-paperback/-/A-12938578?ref=tgt_adv_XSG10001&AFID=Froogle_df&LNM=12938578&CPNG=Entertainment&ci_src=14110944&ci_sku=12938578 because the request was invalid.

This might be because the link was created a long time ago. Try your search again on Google. That’s all we know.