ANSWERS: 5

6, then 6, then 8

3?

3

I need a number two....

6 (for eleven: each term is the number of letters needed to write the sequence of integers starting from one)  there are some similar brainteasers there:  http://www.braingle.com/brainteasers/teaser.php?op=2&id=149&comm=0  https://www.freemathhelp.com/forum/threads/53072Findthenextnumberinthesequence335443
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