1
11
21
1211
111221
31221
13112221
1113213211
31131211131221
Does anyone know what the 10th line would be?
11
21
1211
111221
31221
13112221
1113213211
31131211131221
Does anyone know what the 10th line would be?
-
It would be
13211311123113112211.
The rule in this sequence is that each line is a description of the one before it. For example, the line
1211
has one 1 followed by one 2 followed by two 1s, so to make the next line we write down, successively, 1 1, 1 2, and 2 1, making it
111221.
There is a typo in the 6th line, which should be
312211.
This sequence is OEIS A005150.
.
13211311123113112211.
The rule in this sequence is that each line is a description of the one before it. For example, the line
1211
has one 1 followed by one 2 followed by two 1s, so to make the next line we write down, successively, 1 1, 1 2, and 2 1, making it
111221.
There is a typo in the 6th line, which should be
312211.
This sequence is OEIS A005150.
.
-
13211311123113112211
explanation
first line 1
second line 11 (one 1 in the first line)
third line 21 (two 1s in the second line)
fourth line 1211 (one 2 and one 1 in the third line)
fifth line 111221 (one 1, one 2 and two 1s in the fourth line)
and so on...
explanation
first line 1
second line 11 (one 1 in the first line)
third line 21 (two 1s in the second line)
fourth line 1211 (one 2 and one 1 in the third line)
fifth line 111221 (one 1, one 2 and two 1s in the fourth line)
and so on...
-
13211311123113112211
because it's one three, two ones, one three, and so on.
because it's one three, two ones, one three, and so on.