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Q: How many 2 digits numbers are such that the difference of the number and the number with the digits reversed is a perfect square?

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Prime numbers that are still prime after their digits are reversed, like (13,31)(17,71)(37,73)(79,97)(107,701)(113,311)

9631. The sequence consists of the prime numbers which, when their digits are reversed, are perfect squares.

7 two-digit numbers.

Some of them are: 11 13 17 37 and 79

13,31 17,71 37,73 79,97

The sum of all palindromic numbers from 1001 to 9999 is 495000.

one is 17 and 71, another one is 11,

The original number would be 28. Swapped around, the number's digits are 82. The difference between the two numbers is 54.

after 11yrs.

11yrs.

The first four digits, written backwards, will be 141.3. The reversed version of pi rounded to 4 digits will be 241.3

There are 17 such numbers.

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