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89 is the smallest prime that is a different number when turned upside down (in this case 68), which is the sum of the first n strobogrammatic numbers, i.e., 0+1+8+11+69 = 89. Does there exist a strobogrammatic number that is the sum of the first n strobogrammatic numbers?

 

  Submitted: 2013-11-10 19:23:27;   Last Modified: 2014-08-30 10:16:45.



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