The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A177853 Partial sums of A018805. 2
 1, 4, 11, 22, 41, 64, 99, 142, 197, 260, 343, 434, 549, 676, 819, 978, 1169, 1372, 1611, 1866, 2145, 2444, 2787, 3146, 3545, 3968, 4427, 4910, 5449, 6004, 6619, 7266, 7953, 8672, 9439, 10230, 11093, 11992, 12939, 13918, 14977, 16060, 17227, 18434, 19689 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..1000 FORMULA a(n) ~ 2*n^3/Pi^2. - Vaclav Kotesovec, Sep 14 2021 MATHEMATICA s=0; lst={}; Do[c={}; Do[Do[AppendTo[c, b/a], {b, z}], {a, z}]; AppendTo[lst, s+=Length[Union@c]], {z, 66}]; lst Accumulate[Accumulate[2*EulerPhi[Range[60]]]-1] (* Harvey P. Dale, Nov 23 2019 *) PROG (Haskell) a177853 n = a177853_list !! (n-1) a177853_list = scanl1 (+) a018805_list -- Reinhard Zumkeller, May 04 2014 CROSSREFS Sequence in context: A008043 A088003 A049836 * A008016 A295957 A259574 Adjacent sequences:  A177850 A177851 A177852 * A177854 A177855 A177856 KEYWORD nonn,changed AUTHOR Vladimir Joseph Stephan Orlovsky, May 14 2010 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 September 28 01:27 EDT 2021. Contains 347698 sequences. (Running on oeis4.)