Some Grands Prix had Formula 2 cars running in them, as well as Formula 1 cars. The main reason for this was to increase the number of cars in the races.
Four Grands Prix had Formula 2 entries:
1958 Moroccan Grand Prix
Jack Brabham
Bruce McLaren
Tom Bridger
Robert Lacaze
Francois Picard
Andre Guelfi
1966 German Grand Prix
Jacky Ickx
Jean-Pierre Beltoise
Jo Schlesser
Pedro Rodriguez
Kurt Ahrens
Hans Herrmann
Piers Courage
Alan Rees
1967 German Grand Prix
Jacky Ickx
Jackie Oliver
Alan Rees
Jo Schlesser
David Hobbs
Kurt Ahrens
Gerhard Mitter
Brian Hart
(from a seperate grid)
1969 German Grand Prix
Johnny Servoz-Gavin
Francois Cevert
Henri Pescarolo
Peter Westbury
Kurt Ahrens
Dickie Attwood
Rolf Stommelen
Xavier Perrot
(from a seperate grid)
The competitors listed were credited with a race start in the statistics.