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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

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

AUTHOR

Vladimir Joseph Stephan Orlovsky, May 14 2010

STATUS

approved

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Last modified February 19 04:09 EST 2020. Contains 332037 sequences. (Running on oeis4.)