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A066904 Triangular numbers in A006577. 1
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 (list; graph; refs; listen; history; text; internal format)
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: A285948 A285835 A285823 * 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

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Last modified August 11 04:03 EDT 2020. Contains 336421 sequences. (Running on oeis4.)