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 A074307 Square of permutation in A074305. 3
 0, 2, 3, 1, 11, 5, 7, 13, 6, 4, 10, 19, 9, 27, 21, 15, 29, 14, 8, 18, 35, 17, 43, 37, 23, 45, 22, 12, 26, 51, 25, 59, 53, 31, 61, 30, 16, 34, 67, 33, 75, 69, 39, 77, 38, 20, 42, 83, 41, 91, 85, 47, 93, 46, 24, 50, 99, 49, 107, 101, 55, 109, 54, 28, 58, 115, 57, 123, 117, 63, 125 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS A permutation of the nonnegative integers. LINKS Table of n, a(n) for n=0..70. G. Venturini, Iterates of number-theoretic functions with periodic rational coefficients (Generalization of the 3x+1 problem), Stud. Appl. Math., 86 (1992), 185-218. Index entries for sequences that are permutations of the natural numbers Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,-1). FORMULA a(9*n)=4*n, a(9*n+1)=8*n+2, a(9*n+2)=16*n+3, a(9*n+3)=8*n+1, a(9*n+4)=16*n+11, a(9*n+5)=16*n+5, a(9*n+6)=8*n+7, a(9*n+7)=16*n+13, a(9*n+8)=8*n+6. - Philippe Deléham , Nov 14 2023 PROG (PARI) A074305(m) = if(m%3==0, m/3*2, if(m%3==1, (m-1)/3*4+3, (m-2)/3*4+1)) for(i=0, 120, print1(A074305(A074305(i)), ", ")) \\ C. Ronaldo CROSSREFS Cf. A074305, A074306, A074308. Sequence in context: A009026 A046222 A291647 * A163486 A214649 A007440 Adjacent sequences: A074304 A074305 A074306 * A074308 A074309 A074310 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Sep 23 2002 EXTENSIONS More terms from Lambert Klasen (lambert.klasen(AT)gmx.de), Jan 02 2005 STATUS approved

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Last modified September 10 00:02 EDT 2024. Contains 375765 sequences. (Running on oeis4.)