Published in J. Brit. Astron. Assoc. 93, 20-24 in 1982
G. P. Können and J. Meeus
Triple planet-planet conjunctions are presented for AD 0-3000. It is shown that for Mars-Jupiter and Mars-Saturn two subsequent triple conjunctions can occur with a time separation of one synodic period. Triple conjunctions of bright planets with 1st magnitude stars are briefly discussed.