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 A228014 Numbers k whose Collatz sequence length is greater than k+1 (counting both the x/2 and the 3x+1 steps). 2
 3, 6, 7, 9, 11, 14, 15, 18, 19, 27, 31, 41, 47, 54, 55, 62, 63, 71, 73, 82, 83, 91, 94, 95, 97, 108, 109, 110 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE a(1) is 3 because its Collatz sequence has eight steps: 3, 10, 5, 16, 8, 4, 2, 1. MATHEMATICA Select[Range[1000], Length[Collatz[#]] > #+1 &] (* T. D. Noe, Aug 20 2013 *) CROSSREFS Cf. A082984 (allows number of steps equal to n). Sequence in context: A188974 A047558 A160217 * A188971 A176065 A333552 Adjacent sequences:  A228011 A228012 A228013 * A228015 A228016 A228017 KEYWORD nonn,more AUTHOR Gonzalo Ciruelos, Aug 02 2013 STATUS approved

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Last modified August 5 17:54 EDT 2021. Contains 346488 sequences. (Running on oeis4.)