The OEIS is supported by the many generous donors to the OEIS 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 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A081249 Partial sums of A081134. 5
 0, 1, 1, 2, 4, 7, 9, 10, 10, 11, 13, 16, 20, 25, 31, 38, 46, 55, 63, 70, 76, 81, 85, 88, 90, 91, 91, 92, 94, 97, 101, 106, 112, 119, 127, 136, 146, 157, 169, 182, 196, 211, 227, 244, 262, 281, 301, 322, 344, 367, 391, 416, 442, 469, 495, 520, 544, 567, 589, 610, 630 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS Klaus Brockhaus, Illustration for A081134, A081249, A081250 and A081251 FORMULA a(n) = sum{j=1..n, A081134(j)}. EXAMPLE First seven terms of A081134 are 0,1,0,1,2,3,2, so a(7) = 9. MATHEMATICA Accumulate[Flatten[Table[Join[Range[0, 3^n], Range[3^n-1, 1, -1]], {n, 0, 4}]]] (* Harvey P. Dale, Sep 21 2016 *) PROG (PARI) {s=0; for(n=1, 62, p=3^floor(0.1^25+log(n)/log(3)); print1(s=s+min(n-p, 3*p-n), ", "))} CROSSREFS Sequence in context: A071790 A199465 A288305 * A327217 A327207 A279934 Adjacent sequences: A081246 A081247 A081248 * A081250 A081251 A081252 KEYWORD easy,nonn AUTHOR Klaus Brockhaus, Mar 17 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 3 01:25 EST 2022. Contains 358510 sequences. (Running on oeis4.)