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!)
 A160680 a(n) = sigma_0(F(n-1)) + sigma_0(F(n-2)) where F=A000045 and sigma_0=A000005. 0
 2, 3, 4, 4, 6, 6, 6, 8, 8, 6, 17, 17, 6, 12, 16, 10, 18, 20, 20, 24, 12, 6, 74, 78, 10, 20, 32, 18, 66, 68, 20, 24, 12, 12, 168, 168, 16, 16, 72, 68, 68, 66, 34, 64, 40, 10, 338, 344, 56, 56, 24, 20, 132, 144, 112, 128, 40, 12, 964, 964, 12, 40, 96, 72, 72, 72, 40, 64, 160 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,1 LINKS FORMULA a(n) = A063375(n-1) + A063375(n-2). - R. J. Mathar, May 25 2009, Jun 01 2009 MAPLE A063375 := proc(n) A000005(A000045(n)) ; end: A000045 := proc(n) combinat[fibonacci](n) ; end: A000005 := proc(n) numtheory[tau](n) ; end: for n from 3 to 120 do printf("%d, ", A063375(n-1)+A063375(n-2)) ; od: # R. J. Mathar, May 25 2009 MATHEMATICA Join[{1, 1}, Total[DivisorSigma[0, #]]&/@Partition[Fibonacci[Range[70]], 2, 1]] (* Harvey P. Dale, Mar 07 2012 *) CROSSREFS Cf. A000005, A000045, A063375. Sequence in context: A265533 A145340 A307989 * A243069 A342496 A061984 Adjacent sequences:  A160677 A160678 A160679 * A160681 A160682 A160683 KEYWORD easy,nonn AUTHOR Ctibor O. Zizka, May 23 2009 EXTENSIONS More terms from R. J. Mathar, May 25 2009 Offset changed to 3. - R. J. Mathar, Jun 19 2021 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 9 08:06 EST 2021. Contains 349627 sequences. (Running on oeis4.)