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%I #7 Nov 21 2013 12:50:05
%S 17,71,79,97,107,167,179,701,709,761,769,907,967,971,1097,1471,1487,
%T 1741,1789,1847,1867,1879,1979,7177,7187,7481,7649,7681,7687,7699,
%U 7717,7817,7841,7867,7879,7901,7949,9467,9479,9497,9679,9749,9769,9781,9787
%N Emirps whose only prime digits are 7's.
%t okQ[n_]:=Module[{idn=IntegerDigits[n],rev},rev=Reverse[idn];idn!=rev && Union[Select[idn,PrimeQ]]=={7}&&PrimeQ[FromDigits[rev]]]; Select[ Prime[ Range[1300]],okQ] (* _Harvey P. Dale_, Jul 18 2011 *)
%Y Cf. A006567, A179039.
%K base,nonn
%O 1,1
%A _Lekraj Beedassy_, Jun 25 2010
%E Terms confirmed by _Ray Chandler_, Jul 13 2010