User:Ya-Ping Lu

I am interested in math since I was a child. Solving math puzzles and playing games associated with numbers have always been my favorite hobbies. I have a PhD degree in Engineering and have worked in academic and industry for more than 20 years. Recently I spent a lot of time working on the polytope representation of natural numbers (see A065855, A064047, A333524 through A333528). For personal contact I can be reached at luyaping1@yahoo.com.