April 13, 2015

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

What is the next number in this sequence:

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

5 comments:

  1. 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

    ReplyDelete
  2. 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

    ReplyDelete