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A074305 a(3m) = 2m, a(3m+1) = 4m+3, a(3m+2) = 4m+1. 3
0, 3, 1, 2, 7, 5, 4, 11, 9, 6, 15, 13, 8, 19, 17, 10, 23, 21, 12, 27, 25, 14, 31, 29, 16, 35, 33, 18, 39, 37, 20, 43, 41, 22, 47, 45, 24, 51, 49, 26, 55, 53, 28, 59, 57, 30, 63, 61, 32, 67, 65, 34, 71, 69, 36, 75, 73, 38, 79, 77, 40, 83, 81, 42, 87, 85, 44, 91, 89, 46, 95, 93 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

A permutation of the nonnegative integers.

REFERENCES

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

LINKS

Table of n, a(n) for n=0..71.

Index entries for sequences that are permutations of the natural numbers

FORMULA

G.f.: x(x^2-x+1)(3x^2+4x+3)/(x^3-1)^2. - Ralf Stephan, Mar 19 2003

CROSSREFS

Cf. A074306, A074307, A074308.

Sequence in context: A134348 A191862 A266055 * A151855 A186366 A135338

Adjacent sequences:  A074302 A074303 A074304 * A074306 A074307 A074308

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Sep 23 2002

EXTENSIONS

More terms from Ralf Stephan, Mar 19 2003

STATUS

approved

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Last modified January 16 03:55 EST 2019. Contains 319184 sequences. (Running on oeis4.)