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Double Trouble (Posted on 2005-07-25) Difficulty: 3 of 5
What are the next numbers in this sequence?

4, 5, 8, 8, 9, 9, 12, 13, 13, 13, ?, ?

See The Solution Submitted by Lisa    
Rating: 3.6000 (5 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution i likt it | Comment 7 of 14 |
a(n) = n + number of letters in the English name of n. offset=1


so:....17,18,21 .. etc

i like it...... not likt it

Edited on February 22, 2014, 4:44 am
  Posted by Ady TZIDON on 2005-07-25 11:40:05

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