0,1

R. K. Guy, Unsolved Problems in Number Theory, E16.

Index entries for sequences related to 3x+1 (or Collatz) problem

f := proc(n) option remember; if n = 0 then 87; elif f(n-1) mod 2 = 0 then f(n-1)/2 else 3*f(n-1)+1; fi; end;

Sequence in context: A133524 A020314 A008899 this_sequence A033631 A098139 A109601

Adjacent sequences: A008876 A008877 A008878 this_sequence A008880 A008881 A008882

nonn

njas