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A134996
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Dihedral calculator primes: p, p upside down, p in a mirror, p upside-down-and-in-a-mirror are all primes.
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1
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2, 5, 11, 101, 181, 1181, 1811, 18181, 108881, 110881, 118081, 120121, 121021, 121151, 150151, 151051, 151121, 180181, 180811, 181081, 188011, 188801, 1008001, 1022201, 1028011, 1055501, 1058011, 1082801, 1085801, 1088081
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| C. K. Caldwell, The Prime Glossary, Dihedral Prime
G. L. Honaker, Jr. and Chris Caldwell, Prime Curios! 108225151
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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EXAMPLE
| 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.)
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CROSSREFS
| Cf. A038136, A048660, A048662.
Sequence in context: A131480 A018847 A178318 * A134998 A078790 A158999
Adjacent sequences: A134993 A134994 A134995 * A134997 A134998 A134999
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KEYWORD
| nonn,base,nice
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AUTHOR
| Mike Keith (domnei(AT)aol.com)
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EXTENSIONS
| 5 added by Patrick Capelle (patrick.capelle(AT)clearwire.be), Feb 06 2008
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