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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
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
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 June 12 14:48 EDT 2024. Contains 373331 sequences. (Running on oeis4.)