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Search: id:A134996
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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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+0
2
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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; listen)
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OFFSET
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1,1
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LINKS
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C. K. Caldwell, The Prime Glossary, Dihedral Prime
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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EXAMPLE
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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
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See A038136 for another version. Cf. A048660, A048662.
Sequence in context: A127010 A131480 A018847 this_sequence A134998 A078790 A158999
Adjacent sequences: A134993 A134994 A134995 this_sequence A134997 A134998 A134999
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KEYWORD
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nonn,base,nice
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AUTHOR
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Mike Keith (domnei(AT)aol.com)
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EXTENSIONS
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5 added by Patrick Capelle (patrick.capelle(AT)clearwire.be), Feb 06 2008
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