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A216059 Smallest number not in Collatz trajectory starting at n. 5
2, 3, 6, 3, 3, 7, 3, 3, 3, 3, 3, 7, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 7, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 7, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
a(n) <= 7; a(A007283(n)) = 7;
a(n) <> 4; a(n) <> 4; a(n) <> 6 for n > 3;
a(n) = A216022(n) + 1.
LINKS
Eric Weisstein's World of Mathematics, Collatz Problem
MATHEMATICA
scoll[n_]:=Sort[NestWhileList[If[EvenQ[#], #/2, 3#+1] &, n, #>1 &]]; Join[{2, 3}, Table[i=1; While[scoll[n][[i]]==i, i++]; i, {n, 3, 86}]] (* Jayanta Basu, May 27 2013 *)
PROG
(Haskell)
import Data.List ((\\))
a216059 n = head $ enumFromTo 1 (maximum ts + 1) \\ ts
where ts = a070165_row n
CROSSREFS
Sequence in context: A322229 A245886 A224504 * A261814 A240965 A084228
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Sep 01 2012
STATUS
approved

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Last modified May 23 14:50 EDT 2024. Contains 372763 sequences. (Running on oeis4.)