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=Gustav!@Friedrich@Ludwig@Eugen@Emil/N=zu@Castell-Castell
Gustav! Friedrich Ludwig Eugen Emil zu Castell-Castell
alternatively: /cgi-bin/llmult/LANG=germ/P=28001010