3
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What is the next number?

$$2,3,10,12,13,20,?$$

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  • $\begingroup$ Please cite the source of this puzzle. (A quick Google search shows this isn't your own puzzle) $\endgroup$ – Greg Jan 25 at 14:24
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    $\begingroup$ @Greg well, it was a math teacher I had 5 years ago that told me, I picked it up from there... do I need to cite him as a source? $\endgroup$ – J. Dionisio Jan 25 at 14:26
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    $\begingroup$ Ahh, in that case, I would say no. $\endgroup$ – Greg Jan 25 at 14:27
6
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My guess is:

21

because

the list is all numbers whose name begins with 't'

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  • $\begingroup$ dang it, that was quick! Adapted it from my language, where the sequence would be: $$2,10,12,16,17,18,19,200$$ $\endgroup$ – J. Dionisio Jan 25 at 14:24

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