Palindromic

A palindromic number reads the same forwards and backwards in base 10. For example, 121 and 1331 are palindromic. They are a classic puzzle and appear in recreational mathematics.

Key features

• Single-digit numbers are trivially palindromic.
• Palindromic primes exist (e.g. 2, 3, 5, 7, 11, 101).

Examples:

121, 1331, 101, 99, 1001

Further reading

• Palindromic on Wikipedia
• Palindromic on OEIS