N is a 4-digit positive integer, whose last digit is not zero, and which does not contain any leading zeros. R(N) is the four-digit integer obtained by reversing the digits of N; for example, R(4386) = 6834

Determine all values of N that satisfy: R(N) = 4N + 3

ans: 1779

1997*4+3=7991

Posted by Ady TZIDON on 2015-07-27 08:54:38