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I'm going to put in a series just to comply, but I was wondering if anyone had advice for figuring out patterns in numbers. All I hear is that some people are natural at it.

4, 6, 10, 18...

the context here is GED, so don't make answers too complicated.

Thanks

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    @Angela: Just a small observation: if you state it that way, you have to make $0$ a bit of a special case. The recursive definition that I used avoids that very minor irregularity but is otherwise identical.2011-09-18

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Let's define recursive formula $a_n=a_{n-1}+2^{n-1}$, so the next number is $a_5=18+2^4=34$