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=Gabriel!@Johann@Georg@Johann@Baptist@Virgil@Anton/N=v.Gudenus
Gabriel! Johann Georg Johann Baptist Virgil Anton v.Gudenus
alternatively: /cgi-bin/llmult/LANG=germ/P=51003079