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From "All the Math that's Fit to Print" by Keith Devlin, pages 180 and 182.
[The Mathematical Association of America - MAA Online]
Find a palindrome that when multiplied with 123456789
gives a number that ends with its reversal ....987654321.

Answer : that number is 989010989
The result is 122100120987654321

These and other Nine Digit Curiosities are collected in The Nine Digits Page

A000039 Prime Curios! Prime Puzzle
Wikipedia 39 Le Nombre 39 Numberland 39

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