The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A090636 Trajectory of 15 under the map k -> A003415(k) (taking the arithmetic derivative). 6
 15, 8, 12, 16, 32, 80, 176, 368, 752, 1520, 3424, 8592, 20096, 70464, 235072, 705280, 3023616, 13223680, 55540736, 278539264, 1392697344, 9541095424, 58609614848, 410267320320, 3397142953984, 24143851798528, 176071227916288, 1232666139967488 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..28. FORMULA a(n) = A129150(n-2) for n>1. - Reinhard Zumkeller, Apr 01 2007 PROG (Haskell) a090636 n = a090636_list !! (n-1) a090636_list = iterate a003415 15 -- Reinhard Zumkeller, Apr 29 2012 (PARI) A090636(n, a=15)={if(n<0, vector(-n, n, if(n>1, a=A003415(a), a)), for(n=2, n, a=A003415(a)); a)} \\ For n<0 return the vector a[1..-n]. - M. F. Hasler, Nov 27 2019 CROSSREFS Sequence in context: A194707 A094501 A320572 * A126892 A195035 A245624 Adjacent sequences: A090633 A090634 A090635 * A090637 A090638 A090639 KEYWORD nonn AUTHOR N. J. A. Sloane, Dec 14 2003 EXTENSIONS More explicit name from M. F. Hasler, Nov 27 2019 STATUS approved

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

Last modified February 28 17:13 EST 2024. Contains 370400 sequences. (Running on oeis4.)