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Search: id:A007597
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| A007597 |
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Strobogrammatic primes.
(Formerly M4800)
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+0
13
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| 11, 101, 181, 619, 16091, 18181, 19861, 61819, 116911, 119611, 160091, 169691, 191161, 196961, 686989, 688889, 1008001, 1068901, 1160911, 1180811, 1190611, 1191611, 1681891, 1690691, 1880881, 1881881, 1898681, 1908061, 1960961, 1990661
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Primes which are invariant under a 180 degree rotation.
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
"Strobogrammatic Primes and Prime Rotative Twins" by Charles W. Trigg, J. Rec. Math., 15 (1983), 281-282.
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LINKS
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C. K. Caldwell, The Prime Glossary, Strobogrammatic
Wikipedia, Strobogrammatic prime
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MATHEMATICA
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lst = {}; fQ[n_] := Block[{allset = {0, 1, 6, 8, 9}, id = IntegerDigits@n}, Union@ Join[id, allset] == allset && Reverse[id /. {6 -> 9, 9 -> 6}] == id]; Do[ If[ PrimeQ@n && fQ@n, AppendTo[lst, n]], {n, 2000000}]; lst (* Robert G. Wilson v (rgwv(at)rgwv.com), Feb 27 2007 *)
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CROSSREFS
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Cf. A000787.
Sequence in context: A089716 A084987 A083185 this_sequence A061247 A068188 A032592
Adjacent sequences: A007594 A007595 A007596 this_sequence A007598 A007599 A007600
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KEYWORD
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base,nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Robert G. Wilson v (rgwv(AT)rgwv.com)
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EXTENSIONS
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More terms from David W. Wilson (davidwwilson(AT)comcast.net)
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