login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A183213 Ordering of the numbers in the set S generated by these rules:  1 is in S, and if n is in S, then floor[(3n-1)/2] and 3n are in S. 3
1, 3, 4, 5, 7, 9, 10, 12, 13, 14, 15, 17, 19, 20, 21, 22, 25, 27, 28, 29, 30, 31, 32, 36, 37, 39, 40, 41, 42, 43, 44, 45, 46, 47, 51, 53, 55, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 70, 75, 76, 79, 81, 82, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 100, 101, 104, 108, 111, 112, 113, 117, 118, 120, 121, 122, 123, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This sequence results from flattening and sorting the tree at A183211.  Complement of A178931, obtained from the tree at A183212.

LINKS

Ivan Neretin, Table of n, a(n) for n = 1..10000

FORMULA

(See the Mathematica code.)

MATHEMATICA

nn=200; t={1}; t0=t; While[t=Select[Union[t, Floor[(3*t-1)/2], 3*t], #<=nn &]; t0 != t, t0=t]; t

f[s_List] := Select[ Union@ Join[s, Floor[(3 s - 1)/2], 3 s], # < 201 &]; NestWhile[f, {1}, UnsameQ, All]

CROSSREFS

Cf. A183211, A178931.

Sequence in context: A213637 A047251 A258932 * A183172 A136495 A184419

Adjacent sequences:  A183210 A183211 A183212 * A183214 A183215 A183216

KEYWORD

nonn

AUTHOR

Clark Kimberling, Dec 30 2010

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 6 04:20 EST 2021. Contains 349562 sequences. (Running on oeis4.)