Problem 235. Project Euler: Problem 4, Palindromic numbers

Created by Doug Hull

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A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 99.

Find the largest palindrome made from the product of numbers less than or equal to the input number.

Thank you to Project Euler Problem 4

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Last Solution submitted on May 29, 2020

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Alan Chalker on 16 Feb 2012

Your last test case is accidentally all commented out, so isn't a real test case

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Aurelien Queffurust on 22 Jun 2012

Cheating ...

Ned Gulley on 22 Jun 2012

Thanks for the note Aurelien. I added to the test suite.

zd c on 23 Apr 2020

the largest palindrome made from the product of 9999 is 99977999， not 99000099！
and x=999，y=997799, not 906609.
x=2500, y=6249246, not 6167616
x=100, y=999, not 9009

ChrisR on 9 May 2020 at 21:16

zd c, 99977999 cannot be written as the product of two numbers less than or equal to 9999.

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Aurelien Queffurust on 22 Jun 2012

Size 42 ! wow should be the best solution

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Problem 235. Project Euler: Problem 4, Palindromic numbers

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Problem 235. Project Euler: Problem 4, Palindromic numbers

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