Significant Numbers: Great to Know

[Mithrandir]

Tolkien has many reoccuring numbers, or significant numbers, that he uses throughout "The Lord of the Rings" and "The Silmarillion", just like some numbers in the Bible, like the number 40; 40 days and 40 nights Noah was in the flood. Also 40 days and 40 nights, Jesus fasted, and so on.

Here are ones that I have picked up so far for Tolkien:

3: 3 rings for the elves, 3 Silmarils, 3 companions(Aragorn, Legolas, Gimli in the beginning of TTT)

2: 2 Lamps of the Valar, 2 Trees of the Valar, 2 ring bearers (Frodo and Sam)

9: 9 Companions (The Fellowship), 9 rings for mortal men (Nazgul)

1: One Ring, One King (Aragorn), One Lord of the Ring

I also think 5 is a significant number but I can only think of one; there are 5 Istari. Are there 5 palantiri?

Please continue and add on if you find anymore significant numbers, thanks