%I A134996
%S A134996 2,5,11,101,181,1181,1811,18181,108881,110881,118081,120121,121021,
%T A134996 121151,150151,151051,151121,180181,180811,181081,188011,188801,
%U A134996 1008001,1022201,1028011,1055501,1058011,1082801,1085801,1088081
%N A134996 Dihedral calculator primes: p, p upside down, p in a mirror, p upside-down-and-in-a-mirror 
               are all primes.
%H A134996 C. K. Caldwell, The Prime Glossary, <a href="http://primes.utm.edu/glossary/
               page.php?sort=DihedralPrime">Dihedral Prime</a>
%H A134996 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               DihedralPrime.html">Link to a section of The World of Mathematics.</
               a>
%e A134996 120121 is such a number because 120121, 121021 (upside down), 151051 
               (mirror) and 150151 are all prime. (This is the smallest one in which 
               all four numbers are distinct.)
%Y A134996 See A038136 for another version. Cf. A048660, A048662.
%Y A134996 Sequence in context: A127010 A131480 A018847 this_sequence A134998 A078790 
               A158999
%Y A134996 Adjacent sequences: A134993 A134994 A134995 this_sequence A134997 A134998 
               A134999
%K A134996 nonn,base,nice
%O A134996 1,1
%A A134996 Mike Keith (domnei(AT)aol.com)
%E A134996 5 added by Patrick Capelle (patrick.capelle(AT)clearwire.be), Feb 06 
               2008