Critical Thinking Puzzles: 5, 15, 1115, 3115, 132115, 1113122115, 311311222115, ?

April 13, 2015

What is the next number in this sequence:

5, 15, 1115, 3115, 132115, 1113122115, 311311222115, ?

Dogtag114 said...: 13211321322115; April 14, 2015 at 12:55 AM
Josh D. said...: 13211321322115; April 14, 2015 at 12:57 AM
Unknown said...: basically keep counting the number of digits

5 -> there is 1 5 so 15
15 -> one 1 and one 5 so 1115
1115 -> three 1s and one 5 so 3115
and so on; April 14, 2015 at 7:41 PM
Unknown said...: basically keep counting the number of digits
5 -> one 5 so 15
15 -> one 1 and one 5 so 1115
1115 -> three 1s and one 5 so 3115

and so on; April 14, 2015 at 7:42 PM
Anonymous said...: 13211321322115; September 21, 2015 at 6:04 AM