lew (05/28/82)
A little arithmetic can help, even in a string problem. We can cast problem in the equation: 2 * ( 10*x + n ) == 10**p * n + x , which becomes 19 * x == ( 10**p - 2 ) * n Of course, we have the restrictions that 1 <= n <= 9, and that x is a p-digit number. It follows then that 19 must be a factor of 10**p - 2. This least value of p for which this is true is 17. We then have solutions for n = 1 thru 9 , such that n*(10**17 - 2)/19 is a 17 digit number. This allows solutions for n = 2 thru 9. Lew Mammel, Jr. - BTL Indian Hill