Fibonacci Sequence

andrejv's blog

Wolfram Koepf

http://www.mathematik.uni-kassel.de/~koepf/

https://titanwolf.org/Network/Articles/Article?AID=44a22107-6339-4d8d-a74a-f80497a9c25a#gsc.tab=0

number theory

https://maths.cnam.fr/Membres/wilk/MathMax/help/Maxima/maxima_31.html