Introduction to Fibonacci numbers (1,2,3,5,8,...,)

interesting questions concerning Fibonacci's:

prime Fibonacci's,Departure: given a choice in what to add - construct binary tree

occurrences in nature (sunflower seeds, golden rectangle, etc.)

Fibonacci's mod k

Certain
numbers aren't there (but only a few: ** 23**,

* Also known as Dailey-numbers after their discoverer.