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 A008899 x -> x/2 if x even, x -> 3x - 1 if x odd. 0
 87, 260, 130, 65, 194, 97, 290, 145, 434, 217, 650, 325, 974, 487, 1460, 730, 365, 1094, 547, 1640, 820, 410, 205, 614, 307, 920, 460, 230, 115, 344, 172, 86, 43, 128, 64, 32, 16, 8, 4, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 REFERENCES R. K. Guy, Unsolved Problems in Number Theory, E16. LINKS Index entries for linear recurrences with constant coefficients, signature (0, 1). EXAMPLE 87 is odd, so it's followed by 3 * 87 - 1 = 260. 260 is even, so it's followed by 260/2 = 130. MATHEMATICA NestList[If[EvenQ[#], #/2, 3# - 1] &, 87, 100] (* Alonso del Arte, Aug 22 2017 *) CROSSREFS Cf. A008879. Sequence in context: A133524 A304509 A020314 * A008879 A186063 A186055 Adjacent sequences:  A008896 A008897 A008898 * A008900 A008901 A008902 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified April 10 16:16 EDT 2021. Contains 342845 sequences. (Running on oeis4.)