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Which 2 digit numbers have palindromic squares?
11
How many palindromic numbers between 100 and 1000?
There are 90 palindromic numbers between 100 and 1000
Can decimal numbers like 20569.8 be palindromic?
As 20569.8 is not palindromic, any number that is like it must contain that property and similarly be non-palindromic, so no.
The smallest non-palindromic number whose square is a palindrome?
That would be 26 . . . its square is 676.There are two smaller palindromic squares . . . 121 and 484 ... but they're the squares of11 and 22 respectively, which are palindromic, so they flunk the question's specifications.
Are there more 11 digit or 12 digit palindromic numbers?
There are more 12-digit palindromic numbers than 11-digit palindromic numbers. This is because the number of possible 12-digit palindromic numbers is greater than the number of possible 11-digit palindromic numbers. In general, the number of palindromic numbers of length n is 9 * 10^((n-1)/2), so for 11-digit palindromic numbers, there are 9 * 10^5 = 900,000 possibilities, while for 12-digit palindromic numbers, there are 9 * 10^6 = 9,000,000 possibilities.
