From: terje.mathisen@nospicedham.tmsw.no   
      
   James Harris wrote:   
   > On 07/12/2017 10:15, Terje Mathisen wrote:   
   >> The largest number is of course what you get by taking the maximum   
   >> 64-bit unsigned value (18446744073709551615) which is 2^64 - 1.   
   >>   
   >> This is a 20-digit number so you just take the first 10 digits and   
   >> reverse them in order to get the largest possible 64-bit base-10   
   >> palindrome: 1844674407 7044764481   
   >   
   > Maybe I misunderstand the requirement but if the palindrome is expected   
   > to fit in 64 bits wouldn't the one you mention be too large (because it   
   > is followed by a lower digit, 3, in the original? Perhaps the first   
   > part's trailing 7 could be reduced to a 6.   
   >   
   >   1844674406 6044764481   
   >   
   Oops, you're absolutely correct!   
      
   Mea culpa.   
      
   The highest possible is the one you show.   
      
   Terje   
      
   --   
   -    
   "almost all programming can be viewed as an exercise in caching"   
      
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