Note that the index numbers are only technical numbers which have no persistence. After a new system generation is done, all of them are invalid. To generate a persistent link, use the name.Use the URL:
http://ww-person.com/cgi-bin/l3/LANG=engl/F=Paul!@Ludwig@Hans@Anton/N=v.Beneckendorff@u.@v.Hindenburg
Paul! Ludwig Hans Anton v.Beneckendorff u. v.Hindenburg
alternatively: /cgi-bin/llmult/LANG=germ/P=11004227