Those Apollo missions were unmanned hardware test flights, and often fall under different designations. Apollo 2 is actually named AS-201 and Apollo 3 is AS-202.
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The Apollo program aimed to land humans on the Moon and return them safely to Earth, which was accomplished with Apollo 11. There were plans for Apollo 2 and 3, but they were canceled to focus on perfecting the technology and techniques needed for landing on the Moon. Skipping directly to Apollo 4 allowed NASA to begin testing the hardware for the lunar missions.
There was no Apollo 3 mission. The Apollo missions started with Apollo 7.
No one flew in Apollo 2. The Apollo program's first crewed mission was Apollo 7. Apollo 2 was an uncrewed test flight that was eventually cancelled.
There were no astronauts on the Apollo 3 mission. The Apollo program's first crewed mission was Apollo 7.
There is no Apollo-2 mission. The Apollo program only went up to Apollo 17.
There was no Apollo 2-6 mission. The Apollo program consisted of missions numbered from Apollo 1 to Apollo 17, with some missions being canceled or renumbered. Apollo 1 ended tragically in a fire during a pre-launch test, and Apollo 2-6 were either test flights or unmanned missions that were not carried out as part of the program.