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

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!)
 A087829 a[n] =a[a[Abs[n - a[n-1]]]] + a[Abs[n - a[n-4]]] 0
 1, 1, 1, 1, 2, 3, 4, 5, 5, 5, 5, 5, 7, 6, 7, 7, 7, 7, 7, 11, 8, 10, 11, 11, 10, 11, 11, 11, 11, 11, 16, 12, 15, 15, 12, 16, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 23, 17, 20, 20, 18, 19, 22, 20, 20, 22, 17, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 34, 24, 27, 27, 27, 25, 27 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 COMMENTS A triple recursion of the skip two Hofstadter Q sequence. LINKS MATHEMATICA Hofstadter14[n_Integer?Positive] := Hofstadter14[n] = Hofstadter14[Hofstadter14[Abs[n - Hofstadter14[n-1]]]] + Hofstadter14[Abs[n - Hofstadter14[n-4]]] Hofstadter14[0] = Hofstadter14[1] = Hofstadter14[2]= Hofstadter14[3]= Hofstadter14[4]= 1 digits=200 ta=Table[Hofstadter14[n], {n, 1, digits}] CROSSREFS Cf. A005185. Sequence in context: A067854 A194214 A251416 * A078474 A087177 A180600 Adjacent sequences:  A087826 A087827 A087828 * A087830 A087831 A087832 KEYWORD nonn AUTHOR Roger L. Bagula, Oct 06 2003 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 December 4 09:10 EST 2021. Contains 349484 sequences. (Running on oeis4.)