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The sequence is of two alternating series of numbers.

The first series starts with 3 and increments by 3

i.e. 3,-,6,-,9,-,

The second series starts with 4 and increments by 4

i.e. -,4,-,8,-,12,-,16

But when the '3' series reaches a number which has already been used by the '4' series, it adds another 3,

i.e. 3,4,6,8,9,12,15,16,18,

Following this pattern, the series would continue

3,4,6,8,9,12,15,16,18,20,21,24,27,28,30,32,33,36,39etc

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16y ago

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