1993 OIM Problems/Problem 1
Problem
A natural number is a palindrome if when written in decimal notation, it can be read equally from left to right and from right to left, for example: 8, 23432, 6446.
Let all be palindrome numbers. For each let .
How many different prime numbers does the set have?
~translated into English by Tomas Diaz. ~orders@tomasdiaz.com
Solution
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