13
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What is the next number of this series?

1 , 4 , 5 , 6 , 7 , 9 , 11 ?

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27
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These are...

numbers not containing the letter "T". The next one is 100.

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  • $\begingroup$ It's the correct answer.... $\endgroup$ – Ram Visagan Jul 29 '16 at 13:50

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