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+ The only prime in the following alphametic:
       UK 
      USA 
   + USSR
   -------- 
    ABOMB.
[Madachy]

+ The largest prime containing only odd digits, in decreasing order. [Hasler]

+ The largest prime formed from the concatenation of one-digit composite number, one-digit prime number, and one-digit number that is neither prime nor composite. [Wesolowski]

+ The smallest emirp p which taken together with the pth prime, also an emirp (7649), forms yet another emirp (9717649). [Beedassy]

(There are 2 curios for this number that have not yet been approved by an editor.)




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