There are 10 3-digit odd palindromes that are divisible by five.
Nine. The sum of the digits must be a multiple of 9; because of the repeated digits, this is only possible if the first two digits add up to 9.
There are 90 four-digit palindromes
There is 90 four digit palindromes.
For there to be palindromes, each digit must be replicated. Therefore there are at most three distinct digits.If there are 3 pairs of different digits, then there are 6 palindromes. If there can be more duplicate digits, then there are 27 palindromes.
There are 10 3-digit odd palindromes that are divisible by five.
Nine. The sum of the digits must be a multiple of 9; because of the repeated digits, this is only possible if the first two digits add up to 9.
There are 90 four-digit palindromes
There is 90 four digit palindromes.
For there to be palindromes, each digit must be replicated. Therefore there are at most three distinct digits.If there are 3 pairs of different digits, then there are 6 palindromes. If there can be more duplicate digits, then there are 27 palindromes.
A three digit number cannot be divisible by a 5 digit number - in any base.
There are 90 four-digit palindromes
There are no four-digit perfect squares that are palindromes.
There are 900 6-digit palindromes.
171, 252, 333, 414, 585, 666, 747, 828, 909, 999
128.
There are 17 palindromes between 1 and 1000 that are divisible by 11