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 A003233 Numbers n such that A003231(A001950(n)) = A001950(A003231(n)). (Formerly M0944) 4
 1, 2, 4, 5, 6, 7, 9, 10, 12, 13, 14, 15, 17, 18, 20, 22, 23, 25, 26, 27, 28, 30, 31, 33, 34, 35, 36, 38, 39, 40, 41, 43, 44, 46, 47, 48, 49, 51, 52, 54, 56, 57, 59, 60, 61, 62, 64, 65, 67, 68, 69, 70, 72, 73, 75, 77, 78, 80, 81, 82, 83, 85, 86, 88, 89, 90, 91 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS See 3.3 p. 344 in Carlitz link. - Michel Marcus, Feb 02 2014 This is the function named r in [Carlitz]. - Eric M. Schmidt, Aug 14 2014 REFERENCES N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS L. Carlitz, R. Scoville and T. Vaughan, Some arithmetic functions related to Fibonacci numbers, Fib. Quart., 11 (1973), 337-386. MATHEMATICA a3221[n_] := Floor[n(5 + Sqrt[5])/2]; a1950[n_] := Floor[n(1 + Sqrt[5])^2/4]; Select[Range[100], a3221[a1950[#]] == a1950[a3221[#]]&] (* Jean-François Alcover, Aug 04 2018 *) PROG (PARI) A001950(n) = floor(n*(sqrt(5)+3)/2); A003231(n) = floor(n*(sqrt(5)+5)/2); lista(nn) = { for(n=1, nn, if (A003231(A001950(n)) == A001950(A003231(n)), print1(n, ", "))); } \\ Michel Marcus, Feb 02 2014 (Haskell) a003233 n = a003233_list !! (n-1) a003233_list = [x | x <- [1..],                     a003231 (a001950 x) == a001950 (a003231 x)] -- Reinhard Zumkeller, Oct 03 2014 CROSSREFS Cf. A001950, A003231, A003334. Sequence in context: A187485 A039052 A047572 * A218544 A286045 A127032 Adjacent sequences:  A003230 A003231 A003232 * A003234 A003235 A003236 KEYWORD nonn AUTHOR EXTENSIONS More terms from Michel Marcus, Feb 02 2014 Definition from Michel Marcus moved from comment to name by Eric M. Schmidt, Aug 17 2014 STATUS approved

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Last modified October 22 10:17 EDT 2019. Contains 328315 sequences. (Running on oeis4.)