Functions & Sequences

1. Diagrams of functions (Rosen, §2.3, Fig. 5, p. 139)

2. Rapaport, William J. (2007), "What Is Computation?"
   • Describes what a function is, and relates it to the notion of computation.

3. O'Connor, J.J.; & Robertson, E.F. (2005), "The Function Concept"
   • A brief history of the concept of "function"

4. Does a function in mathematics change anything?

5. 
   The On-Line Encyclopedia of Integer Sequences
   • What rule generates this sequence?
     • 1, 11, 111, 15, 5, 51, 511, 5111, 110, 10, 101, 1011, 10111, 1015, 105, ...

     For the answer, enter that sequence in the above website's search box!