puzzles from Car Talk Plaza

Next Number in the Series
RAY: This is one of those "What's the next number in the series?" puzzlers.
Get a pencil and paper and write this series of numbers down. 335 443 554_.
So there are nine numbers, 335443554 _, followed by a blank.
What's the blank, and why? And that's the hint!

If you have an answer you can answer it here:
Contact Us
If you want an answer you will have to wait for one week. You will need
to search around the site for an answer. Its not easy to find.

Sabertooth said:

Welcome back @ilovejcsog .

I am going to guess 6. I will explain my rationale if my answer proves to be correct.

Click to expand...

Thank you for the warm welcome back!
I thought I might see you here, lol.
I am not good with the math questions but I did realize that the first two groups equal 11 each?