# What's the Next number in series #1?

Can you find the next number in the below sequence

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


The next number is

20

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.

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