Problem of the Day
A new programming or logic puzzle every Mon-Fri

Lychrel Numbers

The last day of April. Today's goal is to find all lychrel numbers below 10,000. A lychrel number is a natural number which cannot form a palindrome through the iterative process of repeatedly reversing its digits and adding the resulting numbers. One example of a non-lychrel number is 56 (100 + 001 = 101) and an example of a lychrel number is 32 (37 + 73 = 110).



  • Anonymous - 8 years, 1 month ago

    In base ten, no Lychrel numbers have been yet proved to exist.

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  • (optional) - 8 years, 1 month ago

    so far i found these numbers to be lychrel numbers under 10000:

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