OFFSET
0,2
COMMENTS
Are the unique values a subset of A006884? - Ralf Stephan, May 27 2013
This sequence is important for the computation of Collatz numbers. It shows that using 31-bit integers, only numbers less than 159487 can have their Collatz trajectory computed.
LINKS
T. D. Noe, Table of n, a(n) for n = 0..63
Eric Roosendaal, 3x+1 path records
MATHEMATICA
mcoll[n_]:=Max@@NestWhileList[If[EvenQ[#], #/2, 3#+1] &, n, #>1 &]; i=1; Join[{1, 3}, Table[i=i; While[mcoll[i]<2^n, i=i+2]; i, {n, 2, 30}]] (* Jayanta Basu, May 27 2013 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
T. D. Noe, Feb 19 2013
STATUS
approved