Palindromic Numbers
A palindromic number is a number that is written the same forward or backward, such as 444 or 969.
Take the number 792 and add it to it's palindrome 297. Take the solution of that number and keep on adding it to it's palindrome until you reach a palindromic number.
Is the number of steps, including the beginning addition, it took you to reach that number a prime number or composite number?
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1 solution
792 + 297 = 1089 (1)
1089 + 9801 = 10890 (2)
10890 + 09801 = 20691 (3)
20691 + 19602 = 40293 (4)
40293 + 39204 = 79497 (5)
It took 5 steps. 5 is a prime number.