Question

What would be the seventh rung of the following pyramid?
1
11
21
1211
111221
312211
13112221

Answer 1

Hello,

It's a known trick... Next row is:
1113213211

The first term of the sequence is 1.
The second term is the plain reading of the first one: "One 1". i.e. 11
The third term reads the second one: "Two 1". i.e. 21
...
So the eighth term reads the seven term: "One 1, One 3, two 1, three 2, One 1"
i. e. 1113213211

Answer 2

=)