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 A213916 Sum of all odd numbers in Collatz (3x+1) trajectory of n. 7
 1, 1, 9, 1, 6, 9, 54, 1, 63, 6, 47, 9, 19, 54, 132, 1, 36, 63, 95, 6, 22, 47, 117, 9, 120, 19, 20262, 54, 76, 132, 20194, 1, 153, 36, 94, 63, 91, 95, 450, 6, 20235, 22, 248, 47, 81, 117, 20163, 9, 140, 120, 204, 19, 59, 20262, 20426, 54, 305, 76, 411, 132, 178 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS T. D. Noe, Table of n, a(n) for n = 1..10000 FORMULA a(n) = A033493(n) - A213909(n). EXAMPLE a(5)=6 since Collatz trajectory of 5 is 5,16,8,4,2,1. MATHEMATICA Collatz[n_] := NestWhileList[If[EvenQ[#], #/2, 3 # + 1] &, n, # > 1 &]; Table[Total[Select[Collatz[n], OddQ]], {n, 100}] (* T. D. Noe, Mar 05 2013 *) CROSSREFS Cf. A033493, A213909. Sequence in context: A363876 A195712 A296473 * A297815 A021920 A367960 Adjacent sequences: A213913 A213914 A213915 * A213917 A213918 A213919 KEYWORD nonn AUTHOR Jayanta Basu, Mar 05 2013 STATUS approved

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Last modified February 26 01:31 EST 2024. Contains 370335 sequences. (Running on oeis4.)