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 A118561 Lucky numbers for which the reversal is also a lucky number. 4
 1, 3, 7, 9, 13, 15, 31, 33, 37, 51, 73, 99, 111, 115, 133, 141, 151, 163, 169, 171, 189, 193, 195, 303, 327, 331, 339, 361, 385, 391, 393, 399, 511, 529, 535, 537, 579, 583, 591, 717, 723, 727, 729, 735, 739, 777, 787, 925, 927, 933, 937, 961, 975, 979, 981, 993 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..9014 from T. D. Noe) W. Schneider, The First 1,000 Lucky Number. EXAMPLE 133 is in the sequence because (1) it is a lucky number and (2) the reversal 331 is also a lucky number. MATHEMATICA nn = 10^3; t = Range[1, nn, 2]; sieve[n_] := Module[{k = t[[n]]}, t = Delete[t, Table[{i}, {i, k, Length[t], k}]]]; n = 1; While[t[[n]] < Length[t], n++; sieve[n]]; tr = Table[FromDigits[Reverse[IntegerDigits[i]]], {i, t}]; Intersection[t, tr] (* T. D. Noe, Mar 16 2013 *) CROSSREFS Cf. A000959, A309406. Sequence in context: A120226 A137310 A118567 * A309406 A057701 A140291 Adjacent sequences: A118558 A118559 A118560 * A118562 A118563 A118564 KEYWORD base,nonn AUTHOR Luc Stevens (lms022(AT)yahoo.com), May 07 2006 EXTENSIONS Corrected and extended by Adam Panagos (adam.panagos(AT)gmail.com), May 10 2006 957 removed by T. D. Noe, Mar 16 2013 STATUS approved

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Last modified June 14 12:37 EDT 2024. Contains 373400 sequences. (Running on oeis4.)