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The next number in the sequence is 9. The rule is to add 2, then subtract 1, add 2, subtract 1, and so on.

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14y ago
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14y ago

The next number is 20, because 5 plus 1 is 6 and 6 plus 2 is8 and 8 plus three is eleven and eleven plus four is fifteen etc.

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14y ago

add up al digits in followed order: 6+3 = 9+3=12 12+9=21 21+12=33 33+21 = 54

Missing nr is 33

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Q: Find the missing number 6 3 9 12 21 54 87?
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