A066904 Triangular numbers in A006577.

1, 3, 6, 15, 15, 10, 10, 21, 21, 21, 6, 105, 105, 28, 28, 28, 28, 28, 15, 15, 15, 15, 15, 15, 36, 36, 36, 36, 10, 10, 10, 21, 21, 21, 21, 21, 21, 21, 78, 21, 91, 91, 55, 55, 55, 45, 45, 45, 45, 45, 45, 45, 45, 45, 120, 120, 120, 120, 120, 120, 120, 120, 66, 66, 136, 136

Offset

0,2

Links

Harvey P. Dale, Table of n, a(n) for n = 0..2000

Mathematica

Select[Table[Length[NestWhileList[If[EvenQ[#], #/2, 3#+1]&, n, #!=1&]]-1, {n, 1000}], OddQ[Sqrt[8#+1]]&] (* Harvey P. Dale, Feb 06 2015 *)

Crossrefs

Cf. A006577.

Sequence in context: A285835 A285823 A337742 * A310124 A059969 A224864

Adjacent sequences: A066901 A066902 A066903 * A066905 A066906 A066907

Keyword

nonn

Author

K. B. Subramaniam (kb_subramaniambalu(AT)yahoo.com), Dec 20 2001

Extensions

More terms from Sascha Kurz, Mar 23 2002

Status

approved