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 A161600 Nonprime numbers such that TITO(n) = n, where TITO(n) = A161594(n). 8
 1, 4, 6, 8, 9, 22, 26, 33, 39, 44, 46, 55, 62, 66, 69, 77, 82, 86, 88, 93, 99, 121, 143, 169, 187, 202, 206, 226, 242, 252, 253, 262, 286, 299, 303, 309, 339, 341, 343, 363, 393, 404, 422, 446, 451, 466, 473, 482, 484, 505, 525, 583, 606, 616, 622, 626, 633, 662, 669, 671, 682, 686 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 T. Khovanova, Turning Numbers Inside Out [From Tanya Khovanova, Jul 07 2009] MATHEMATICA reversepower[{n_, k_}] := FromDigits[Reverse[IntegerDigits[n]]]^k; f[n_] := FromDigits[Reverse[IntegerDigits[Times @@ Map[reversepower, FactorInteger[n]]]]]; Select[Range[600], f[#] == # && ! PrimeQ[#] &] PROG (Haskell) a161600 n = a161600_list !! (n-1) a161600_list = filter ((== 0) . a010051) a161597_list -- Reinhard Zumkeller, Oct 14 2011 (PARI) is(n)=!isprime(n)&&n==A161594(n) \\ M. F. Hasler, May 11 2015 CROSSREFS Cf. A010051, A161594; subsequence of A161597. Sequence in context: A267509 A162738 A366826 * A032350 A078337 A046351 Adjacent sequences: A161597 A161598 A161599 * A161601 A161602 A161603 KEYWORD nonn,base AUTHOR J. H. Conway & Tanya Khovanova, Jun 14 2009 EXTENSIONS Edited by N. J. A. Sloane, Jun 23 2009 Offset corrected by Reinhard Zumkeller, Oct 14 2011 Minor edits and more displayed terms from M. F. Hasler, May 11 2015 STATUS approved

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Last modified May 29 11:52 EDT 2024. Contains 372940 sequences. (Running on oeis4.)