1984 Austrian Grand Prix (the 400th Grand Prix) had twenty six drivers one of whom is Nelson Piquet.
Pos Michele Alboreto Teo Fabi Thierry Boutsen Marc Surer Riccardo Patrese Philippe Alliot Gerhard Berger Ayrton Senna Alain Prost Huub Rothengatter Eddie Cheever Derek Warwick Jo Gartner Jacques Laffite Stefan Johansson Stefan Bellof Nelson Piquet 
