There are nine two-digit palindromes: 11, 22, 33, 44, 55, 66, 77, 88 and 99.
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90 of them.
There are 90 four-digit palindromes
There is 90 four digit palindromes.
There are no four-digit perfect squares that are palindromes.
There are 10 3-digit odd palindromes that are divisible by five.