This site is supported by donations to The OEIS Foundation.

"Email this user" was broken Aug 14 to 9am Aug 16. If you sent someone a message in this period, please send it again.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A081828 Numbers n such that 2 successive terms of Hofstadter Q-sequence are the same. 6
 1, 4, 7, 9, 10, 12, 13, 18, 20, 21, 22, 25, 27, 28, 29, 32, 41, 43, 44, 45, 46, 54, 59, 60, 61, 82, 87, 90, 91, 92, 93, 94, 102, 111, 133, 154, 157, 163, 177, 182, 186, 187, 188, 189, 190, 273, 334, 342, 350, 360, 367, 378, 379, 380, 381, 382, 418, 431, 441, 464, 483 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A005185(a(n)+1) = A005185(a(n)); A081827(a(n)) = 0. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..250 Eric Weisstein's World of Mathematics, Hofstadter's Q-Sequence Wikipedia, Hofstadter sequence PROG (Haskell) import Data.List (elemIndices) a081828 n = a081828_list !! (n-1) a081828_list = map (+ 1) \$ elemIndices 0 a081827_list -- Reinhard Zumkeller, Sep 15 2011 CROSSREFS Cf. A081829, A081830, A194626. Sequence in context: A268227 A123573 A085746 * A287678 A175149 A153053 Adjacent sequences:  A081825 A081826 A081827 * A081829 A081830 A081831 KEYWORD nonn AUTHOR Benoit Cloitre, Apr 10 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.