Between December of 1965 and October of 1969, the Beatles released a number of classic singles, but these seven were essentially double A-sides. In the U.S. at the time (until the last hit here), the charts would reflect each side individually, since sales weren't the only indicator of chart position.
Realistically, the group could have split these into 14 singles with different B-sides and cashed in commercially. "I Am the Walrus" only charted at number 56, so it's possible airplay was limited by its overtly psychedelic and drug-fueled vibe, but it's clearly a huge song in the group's canon, and in the years since has probably been more of a radio staple than "Hello, Goodbye" (the chart-topping A-side).
"Something" was the initial A-side when backed with "Come Together," but both songs were massive individual hits. Billboard originally charted "Something" at number three, and "Come Together" at number two, but then combined the two as one single and listed it at number one.
As a side note, it's interesting that each of the first six singles here featured a McCartney song on one side and a Lennon song on the other (although "Yellow Submarine" was a John song sung by Ringo). The last was a Harrison/Lennon combination.
Below are the release date, and each song's relative Billboard chart position:
12/65: We Can Work It Out (# 1) b/w Day Tripper (# 5).
08/66: Yellow Submarine (# 1) b/w Eleanor Rigby (# 11)
02/67: Penny Lane (# 1) b/w Strawberry Fields Forever (# 8)
12/67: Hello, Goodbye (# 1) b/w I Am the Walrus (# 56)
08/1968: Hey Jude (# 1) b/w Revolution (# 12)
10/69: Something (# 3) b/w Come Together (# 2) (# 1 combined)
