Claim: 1984 Austrian Grand Prix (the 400th Grand Prix) had twenty six drivers one of whom is Nelson Piquet.
Evidence: Pos Austria Niki Lauda Italy Michele Alboreto Italy Teo Fabi Belgium Thierry Boutsen Switzerland Marc Surer France René Arnoux France François Hesnault United_Kingdom Jonathan Palmer Italy Riccardo Patrese France Philippe Alliot Austria Gerhard Berger France Patrick Tambay Brazil Ayrton Senna United_Kingdom Nigel Mansell France Alain Prost Italy Elio de Angelis Netherlands Huub Rothengatter United_States Eddie Cheever United_Kingdom Derek Warwick Italy Andrea de Cesaris Finland Keke Rosberg Austria Jo Gartner France Jacques Laffite Italy Piercarlo Ghinzani West_Germany Manfred Winkelhock Sweden Stefan Johansson West_Germany Stefan Bellof Brazil Nelson Piquet