What is the link with the number after apollo ?

i was thinking about the relation between the number after apollo. i mean apollo 1 is not the first mission, so why 1 ? or:i was thinking about the re

i was thinking about the relation between the number after apollo. i mean apollo 1 is not the first mission, so why 1 ?

or:i was thinking about the relation between the number after apollo. i mean apollo 1 is not the first mission, so why 1 ?

or:The mission AS-204, in which the 3 astronauts were killed, was renamed Apollo 1 in their honor. AS-201, AS-202, and AS-203 were launched later, unmanned. The subsequent missions were manned, and designated as Apollo 4, 5, 6, etc.

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