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 A008875 3x+1 sequence starting at 95. 5
 95, 286, 143, 430, 215, 646, 323, 970, 485, 1456, 728, 364, 182, 91, 274, 137, 412, 206, 103, 310, 155, 466, 233, 700, 350, 175, 526, 263, 790, 395, 1186, 593, 1780, 890, 445, 1336, 668, 334, 167, 502, 251, 754, 377, 1132, 566, 283, 850, 425, 1276, 638, 319, 958, 479, 1438, 719, 2158, 1079, 3238 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 REFERENCES R. K. Guy, Unsolved Problems in Number Theory, E16. LINKS T. D. Noe, Table of n, a(n) for n=0..105 Index entries for sequences related to 3x+1 (or Collatz) problem FORMULA a(n) = A008874(n + 2). MAPLE f := proc(n) option remember; if n = 0 then 95; elif f(n-1) mod 2 = 0 then f(n-1)/2 else 3*f(n-1)+1; fi; end; MATHEMATICA NestList[If[EvenQ[#], #/2, 3#+1]&, 95, 60] (* Harvey P. Dale, Dec 02 2012 *) PROG (Haskell) a008875 n = a008875_list !! n a008875_list = drop 2 a008874_list -- Reinhard Zumkeller, Aug 30 2012 (Magma) [n eq 1 select 95 else IsOdd(Self(n-1)) select 3*Self(n-1)+1 else Self(n-1) div 2: n in [1..70]]; // Vincenzo Librandi, Jul 29 2014 CROSSREFS Cf. A006370, A008874. Row 95 of A347270. Sequence in context: A116113 A051400 A225931 * A174157 A200882 A217133 Adjacent sequences: A008872 A008873 A008874 * A008876 A008877 A008878 KEYWORD nonn AUTHOR N. J. A. Sloane. EXTENSIONS More terms from Larry Reeves (larryr(AT)acm.org), Apr 27 2001 STATUS approved

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Last modified July 22 10:58 EDT 2024. Contains 374490 sequences. (Running on oeis4.)