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Beginning with the 20, the set of rules to get the next 3 terms is:

Add 3 . . . . . 23

Add 5 . . . . . 28

Take half. . . 14

Add 3 . . . . . 17

Add 5 . . . . . 22

Take half. . . 11

Next comes:

Add 3 . . . . . 14

Add 5 . . . . . 19

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15y ago

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