This site is supported by donations to The OEIS Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A120230 Split-floor-multiplier sequence (SFMS) using multipliers 1/4 and 4. (SFMS is defined at A120229.). 4
 4, 8, 12, 1, 20, 24, 28, 2, 36, 40, 44, 3, 52, 56, 60, 64, 68, 72, 76, 5, 84, 88, 92, 6, 100, 104, 108, 7, 116, 120, 124, 128, 132, 136, 140, 9, 148, 152, 156, 10, 164, 168, 172, 11, 180, 184, 188, 192, 196, 200, 204, 13, 212, 216, 220, 14, 228, 232, 236, 15, 244, 248 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Self-inverse permutation of the natural numbers. LINKS FORMULA a(n)=[n/4] if this is positive and new, else a(n)=4n. EXAMPLE a(1)=1*4 because [1/4] is not positive. a(2)=2*4 because [2/4] is not positive. a(3)=3*4 because [3/4] is not positive. a(4)=1=[4*(1/4)]. a(5)=5*4 because [5/4]=a(4), not new. CROSSREFS Cf. A073675, A120230. Sequence in context: A109239 A056135 A159586 * A086480 A260249 A277616 Adjacent sequences:  A120227 A120228 A120229 * A120231 A120232 A120233 KEYWORD nonn AUTHOR Clark Kimberling, Jun 11 2006 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.

Last modified January 18 11:50 EST 2019. Contains 319271 sequences. (Running on oeis4.)