This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A007597 Strobogrammatic primes. (Formerly M4800) 16
 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, 6081809, 6100019, 6108019 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Primes which are invariant under a 180 degree rotation. REFERENCES N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). C. W. Trigg, "Strobogrammatic Primes and Prime Rotative Twins", J. Rec. Math., 15 (1983), 281-282. LINKS K. D. Bajpai, Table of n, a(n) for n = 1..304 C. K. Caldwell, The Prime Glossary, Strobogrammatic Wikipedia, Strobogrammatic prime MATHEMATICA 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, Feb 27 2007 *) CROSSREFS Cf. A000787. Sequence in context: A089716 A084987 A083185 * A061247 A199328 A068188 Adjacent sequences:  A007594 A007595 A007596 * A007598 A007599 A007600 KEYWORD base,nonn AUTHOR EXTENSIONS More terms from David W. Wilson a(31)-a(33) from K. D. Bajpai, Jun 23 2017 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 20 21:36 EST 2019. Contains 319336 sequences. (Running on oeis4.)