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=Jean@V/N=de@Pontailler@*@de@Magny,@de@Vaux@et@de@Lamposnes
Jean V de Pontailler * de Magny, de Vaux et de Lamposnes
alternatively: /cgi-bin/llmult/LANG=germ/P=6026106