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A179038 Emirps whose only prime digits are 7's. 1
17, 71, 79, 97, 107, 167, 179, 701, 709, 761, 769, 907, 967, 971, 1097, 1471, 1487, 1741, 1789, 1847, 1867, 1879, 1979, 7177, 7187, 7481, 7649, 7681, 7687, 7699, 7717, 7817, 7841, 7867, 7879, 7901, 7949, 9467, 9479, 9497, 9679, 9749, 9769, 9781, 9787 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..45.

MATHEMATICA

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 *)

CROSSREFS

Cf. A006567, A179039.

Sequence in context: A327495 A183943 A180532 * A179039 A152295 A039407

Adjacent sequences:  A179035 A179036 A179037 * A179039 A179040 A179041

KEYWORD

base,nonn

AUTHOR

Lekraj Beedassy, Jun 25 2010

EXTENSIONS

Terms confirmed by Ray Chandler, Jul 13 2010

STATUS

approved

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Last modified October 22 13:19 EDT 2019. Contains 328318 sequences. (Running on oeis4.)