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A066904 Triangular numbers in A006577. 1

%I

%S 1,3,6,15,15,10,10,21,21,21,6,105,105,28,28,28,28,28,15,15,15,15,15,

%T 15,36,36,36,36,10,10,10,21,21,21,21,21,21,21,78,21,91,91,55,55,55,45,

%U 45,45,45,45,45,45,45,45,120,120,120,120,120,120,120,120,66,66,136,136

%N Triangular numbers in A006577.

%H Harvey P. Dale, <a href="/A066904/b066904.txt">Table of n, a(n) for n = 0..2000</a>

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

%Y Cf. A006577.

%K nonn

%O 0,2

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

%E More terms from _Sascha Kurz_, Mar 23 2002

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Last modified September 29 16:13 EDT 2020. Contains 337432 sequences. (Running on oeis4.)