January 2021 Problem of the Month

Most of us are familiar with some of the math day celebrations like Pi Day (March 14), Fibonacci Day (November 23), or World Maths Day (1st Wednesday in March), but there is a lesser known math day called Pythagorean Theorem Day.

Last month, we celebrated Pythagorean Theorem Day on December 16, 2020 (12/16/20), when 12² + 16² = 20².

List IN ORDER by year all Pythagorean Theorem Days that occur each century - either in the form December 16, '20 or 12/16/20.