The Progression should have a base of 11, and a Factor of 1.
Going to work, no time to study now.
- Brian

Javascript code:
https://www.geeksforgeeks.org/program-for-nth-fibonacci-number/

The nth term of an arithmetic sequence
https://www.alamo.edu/contentassets/afe30946fa58450c89840c1173f3b9d0/sequences/math1314-arithmetic-sequences.pdf