Fibonacci Sequence

[Fringe-Freak]

When Walter was reciting the Fibonacci sequence at the end of the episode (and I can't believe I didn't see this before) he misses the number 5.
He says: 1, 1, 2, 3, 8, 13, and so on. I was thinking it MUST have some kind of signifigance, because Walter wouldn't forget the 5, and the writers have researched, and they know their stuff.
So, any ideas??

[Peet]

Interesting

Are there any other times in Fringe where the number 5 is significant?

[Pagemaster]

Well, the Fibonacci sequence played an important role in that episode with the safety deposit boxes, so the writers should know their stuff...
I'm stumped

[Fringe-Freak]

I can't think of any other signifigant 5's... I'm stumped :/