On polynomial pairs of integers

• Main Authors: Ezerman, Martianus Frederic, Meyer, Bertrand, Solé, Patrick
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2015
• Subjects: DRNTU::Science::Mathematics::Algebra; Reversal Multiplication; Palindromic Squares
• Online Access: https://hdl.handle.net/10356/106039; http://hdl.handle.net/10220/26278; https://cs.uwaterloo.ca/journals/JIS/VOL18/Ezerman/eze3.html; https://cs.uwaterloo.ca/journals/JIS/VOL18/Ezerman/eze3.html; https://cs.uwaterloo.ca/journals/JIS/VOL18/Ezerman/eze3.html
• Institution: Nanyang Technological University

The reversal of a positive integer A is the number obtained by reading A backwards in its decimal representation. A pair (A, B) of positive integers is said to be palindromic if the reversal of the product A × B is equal to the product of the reversals of A and B. A pair (A, B) of positive integers is said to be polynomial if the product A × B can be performed without carry. In this paper, we use polynomial pairs in constructing and in studying the properties of palindromic pairs. It is shown that polynomial pairs are always palindromic. It is further conjectured that, provided that neither A nor B is itself a palindrome, all palindromic pairs are polynomial. A connection is made with classical topics in recreational mathematics such as reversal multiplication, palindromic squares, and repunits.