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 A074306 Inverse of permutation in A074305. 3

%I

%S 0,2,3,1,6,5,9,4,12,8,15,7,18,11,21,10,24,14,27,13,30,17,33,16,36,20,

%T 39,19,42,23,45,22,48,26,51,25,54,29,57,28,60,32,63,31,66,35,69,34,72,

%U 38,75,37,78,41,81,40,84,44,87,43,90,47,93,46,96,50,99,49,102,53,105,52

%N Inverse of permutation in A074305.

%C A permutation of the nonnegative integers.

%D G. Venturini, Iterates of number-theoretic functions with periodic rational coefficients (generalization of the 3x+1 problem), Stud. Appl. Math., 86 (1992), 185-218.

%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>

%o (PARI) b(m)=if(m%2==0,m/2*3,if(m%4==3,(m-3)/4*3+1,(m-1)/4*3+2)) for(i=0,120,print1(b(i),",")) (C. Ronaldo)

%Y Cf. A074305, A074307, A074308.

%K nonn,easy

%O 0,2

%A _N. J. A. Sloane_, Sep 23 2002

%E More terms from Lambert Klasen (lambert.klasen(AT)gmx.de), Jan 02 2005

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