
Puzzle Details
What number comes next in this sequence:
1 23 124 1251 26127 128129 ==?==
Puzzle Copyright © Kevin Stone
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A box for your workings out:
Hint: Remove the spaces from the sequence first.
Answer: 1301311.
Removing spaces from the original sequence gives:
1 23 124 1251 26127 128129
123124125126127128129
Now adding spaces back in, in the correct place:
123 124 125 126 127 128 129
So the next few terms should be 130 131 132, so add these to the end:
123 124 125 126 127 128 129 130 131 132
Now remove the spaces again:
123124125126127128129130131132
No break the sequence into chunks of increasing size - as per the original question:
1 23 124 1251 26127 128129 1301311
So the missing term is 1301311.
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