Series Sudoku Puzzle (Fun With Sudoku #38)

This Series Sudoku is quite an old puzzle created by me. I am not able to remember the Series used in this Sudoku. Anyway finding out the series is not required to solve the Sudoku. However, finding the next digit in the series is fun and can be considered a separate puzzle. Hopefully, you will enjoy the Sudoku solving and series solving in the Series Sudoku puzzle.
This Series Sudoku, I  am posting in the Fun With Sudoku Series as the 38th Sudoku puzzle in this series. Can you solve this Series Sudoku puzzle?

Rules of Series Sudoku Puzzle

Series Sudoku Puzzle (Fun With Sudoku #38)

Series Sudoku (Fun With Sudoku #38) Solution

Previous Fun With Sudoku Series Puzzle: Outside Sudoku

Next Fun With Sudoku Series Puzzle: Standard Sudoku 

Solution of Mathrax Sudoku (Daily Sudoku League #81)

Mathrax Sudoku (Daily Sudoku League #81) Solution