If the number with the digits reversed can have a leading 0 so that it is a 1-digit number, then 16. Otherwise 13.
after 11yrs.
69
imm they would b the same wouldn't they, except number 1 may repeat itself (number 1 and 100-001).
525
The number is 36
9631. The sequence consists of the prime numbers which, when their digits are reversed, are perfect squares.
Prime numbers that are still prime after their digits are reversed, like (13,31)(17,71)(37,73)(79,97)(107,701)(113,311)
Some of them are: 11 13 17 37 and 79
7 two-digit numbers.
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 first four digits, written backwards, will be 141.3. The reversed version of pi rounded to 4 digits will be 241.3
after 11yrs.
11yrs.
There are 17 such numbers.
69