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A217744 Numbers whose Collatz trajectory contains equal number of terms of the form 4k+1 and 4k+3. 3
15, 30, 60, 120, 151, 239, 240, 255, 302, 377, 423, 425, 478, 479, 480, 510, 593, 604, 669, 685, 743, 754, 755, 846, 847, 850, 851, 939, 956, 958, 960, 1020, 1053, 1057, 1186, 1191, 1208, 1297, 1321, 1338, 1341, 1370, 1375, 1473, 1486, 1487, 1508, 1509, 1510 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Collatz[n_] :=NestWhileList[If[EvenQ[#], #/2, 3*# + 1] &, n, # > 1 &]; t = {}; Do[If[Length[Select[Collatz[n], Mod[#, 4] == 1 &]] -Length[Select[Collatz[n], Mod[#, 4] == 3 &]] == 0, AppendTo[t, n]], {n, 1500}]; t
CROSSREFS
Sequence in context: A072304 A188237 A190715 * A115811 A110286 A254859
KEYWORD
nonn
AUTHOR
Jayanta Basu, Mar 23 2013
STATUS
approved

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Last modified April 20 21:11 EDT 2024. Contains 371845 sequences. (Running on oeis4.)