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Prime it remains (Posted on 2013-01-15) Difficulty: 3 of 5
What is the smallest prime remaining prime when added to its reverse?

Analytical solution preferred.

No Solution Yet Submitted by Ady TZIDON    
Rating: 4.0000 (2 votes)

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Some Thoughts re: Some observations and two answers. Comment 4 of 4 |
(In reply to Some obverstations and two answers. by Dej Mar)

Actually, if leading zeroes are permissible, then the lowest prime is 00013.  00013 + 31000 = 31013, which is prime.  

Although it may be tied with the number 13 preceded by a larger odd number of zeroes.  0000013 doesn't work, and neither does 000000013 or 00000000013 or 0000000000013, but I'll bet there is some larger odd number of zeroes that do work. 

Or maybe I am just being silly. 

  Posted by Steve Herman on 2013-01-16 14:13:19
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