2016 Update

Task/Hailstone-sequence/Mathematica/hailstone-sequence-5.math

@@ -1 +1,14 @@
-With[{seq = HailstoneFP[27]}, { Length[seq], Take[seq, 4], Take[seq, -4]}]
+Hailstone[n_] :=
+ NestWhileList[Which[Mod[#, 2] == 0, #/2, True, ( 3*# + 1) ] &, n, # != 1 &];
+
+
+c27 = Hailstone@27;
+Print["Hailstone sequence for n = 27: [", c27[[;; 4]], "...", c27[[-4 ;;]], "]"]
+Print["Length Hailstone[27] = ", Length@c27]
+
+longest = -1; comp = 0;
+Do[temp = Length@Hailstone@i;
+ If[comp < temp, comp = temp; longest = i],
+ {i, 100000}
+ ]
+Print["Longest Hailstone sequence at n = ", longest, "\nwith length = ", comp];