This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A218254 Irregular table, where row n (n >= 0) starts with n, the next term is n-A000120(n), and the successive terms are obtained by repeatedly subtracting the number of 1's in the previous term's binary expansion, until zero is reached, after which the next row starts with one larger n. 12
 0, 1, 0, 2, 1, 0, 3, 1, 0, 4, 3, 1, 0, 5, 3, 1, 0, 6, 4, 3, 1, 0, 7, 4, 3, 1, 0, 8, 7, 4, 3, 1, 0, 9, 7, 4, 3, 1, 0, 10, 8, 7, 4, 3, 1, 0, 11, 8, 7, 4, 3, 1, 0, 12, 10, 8, 7, 4, 3, 1, 0, 13, 10, 8, 7, 4, 3, 1, 0, 14, 11, 8, 7, 4, 3, 1, 0, 15, 11, 8, 7, 4, 3, 1, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS Antti Karttunen, Rows 0..255, flattened EXAMPLE The n-th row (starting indexing from zero) in this irregular table consists of block of length A071542(n)+1: 1,2,3,3,4,4,5,5,... which always ends with zero, as: 0 1,0 2,1,0 3,1,0 4,3,1,0 5,3,1,0 6,4,3,1,0 7,4,3,1,0 The 17th term is 6, which in binary is 110. The 18th term is then 6-2=4. PROG (GNU/MIT Scheme with Antti Karttunen's intseq additions): (definec (A218254 n) (cond ((< n 2) n) ((not (zero? (A218254 (- n 1)))) (- (A218254 (- n 1)) (A000120 (A218254 (- n 1))))) (else (+ 1 (A218254 (+ 1 (Apos_of_prev_zero (- n 1)))))))) ;; The following is an auxiliary function not submitted as a separate entry: (define Apos_of_prev_zero (compose-funs A213707 -1+ (LEAST-GTE-I 0 0 A213707))) (PARI) for(n=0, 9, k=n; while(k, print1(k", "); k-=hammingweight(k)); print1("0, ")) \\ Charles R Greathouse IV, Oct 30 2012 CROSSREFS Cf. A218252, A218253. A213707 gives the positions of zeros (i.e. the ending index of each row). A071542, A000120. The reversed tails of the rows converge towards A179016. Sequence in context: A110355 A219659 A029293 * A285037 A264422 A176808 Adjacent sequences:  A218251 A218252 A218253 * A218255 A218256 A218257 KEYWORD nonn,tabf,easy AUTHOR Nico Brown, Oct 24 2012 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 10 04:15 EST 2019. Contains 329885 sequences. (Running on oeis4.)