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A228014
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Numbers k whose Collatz sequence length is greater than k+1 (counting both the x/2 and the 3x+1 steps).
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2
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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
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(1) is 3 because its Collatz sequence has eight steps: 3, 10, 5, 16, 8, 4, 2, 1.
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MATHEMATICA
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Select[Range[1000], Length[Collatz[#]] > #+1 &] (* T. D. Noe, Aug 20 2013 *)
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CROSSREFS
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Cf. A082984 (allows number of steps equal to n).
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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