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A155508
Lesser of emirps (pairs) with digits 1 and 9 only.
3
199, 91199, 111119, 111919, 119191, 991999, 1191119, 1191191, 1191991, 11111911, 11191991, 11919991, 19111991, 91111199, 111111199, 111199199, 191111119, 199991999, 919919999, 1111111999, 1191111991, 1199111191, 1911199999
OFFSET
1,1
LINKS
MATHEMATICA
Flatten[Table[Select[Subsets[Select[FromDigits/@Tuples[{1, 9}, n], PrimeQ], {2}], AllTrue[#, PrimeQ]&&#[[1]]==IntegerReverse[#[[2]]]&][[All, 1]], {n, 3, 10}]/.{}->Nothing] (* Harvey P. Dale, Aug 21 2020 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Lekraj Beedassy, Jan 23 2009
EXTENSIONS
More terms from Sean A. Irvine, Apr 06 2010
STATUS
approved