Can you find the next number in the below sequence

 3 , 7 , 10 , 11 , 12 , 17 ?

Note: if already asked please comment below, as I've searched for this but not found on this site so that I posted it!


The next number is


This is because the sequence refers to numbers which:

Only contain the vowel 'e'
Eg. three, seven, etc.
Thirteen does not qualify because it contains an i, for example.

  • 2
    $\begingroup$ one could argue that 'y' is a vowel $\endgroup$ May 8 '15 at 12:57
  • $\begingroup$ don't the numbers thirteen through nineteen contain 2 e's each, or more? $\endgroup$
    – JLee
    May 8 '15 at 13:30
  • $\begingroup$ @JLee ONLY contain the vowel e. No other vowels $\endgroup$
    – Tryth
    May 8 '15 at 13:41
  • $\begingroup$ ok i see now. thx $\endgroup$
    – JLee
    May 8 '15 at 13:43

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