How many Beatles songs were #1?

Related questions

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2. Did Ringo write any songs for the Beatles?
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5. What was the working title of the Beatles song With a Little Help From My Friends?
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Tags

1. #three
2. #george
3. #chart
4. #martin
5. #billboard
6. #members
7. #states
8. #beatles
9. #compiled
10. #includes
11. #songs
12. #kingdom
13. #united
14. #retailer
15. #surviving
16. #producer
17. #number
18. #record