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=germ/F=Bertrand@I/N=d'Agoult@dit@de@Mison@*@de@Pontmaravel,@de@Beaurieres,@de@la@Vallee,@de@Taurenne,@de@Leches,@du@Pilhon
alternatively: /cgi-bin/llmult/LANG=germ/P=6028135