Definition:Palindromic Number
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Definition
A palindromic number (base $b$) is a number which is a palindrome when expressed in number base $b$.
That is, it reads the same reversed as it does forwards.
When the base is not specified, it is commonplace to understand it as being $10$.
Sequence
The sequence of palindromic integers in base 10 begins:
- $0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 121, 131, \ldots$
Also see
- Results about palindromic numbers can be found here.
Linguistic Note
The word palindrome derives from the Ancient Greek παλίνδρομος (palíndromos), meaning running back again.
This is formed from πάλιν (pálin), meaning back, again, and back again, and δρόμος (drómos), meaning running, race, and racecourse.
Sources
- Weisstein, Eric W. "Palindromic Number." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/PalindromicNumber.html