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A103116 a(n) = A005598(n) - 1. 1
0, 1, 3, 7, 13, 23, 35, 53, 75, 103, 135, 177, 223, 281, 345, 417, 497, 593, 695, 815, 943, 1083, 1233, 1405, 1585, 1785, 1997, 2227, 2469, 2739, 3017, 3325, 3649, 3993, 4353, 4737, 5133, 5565, 6015, 6489, 6979, 7509, 8051, 8635, 9239, 9867, 10517, 11213 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..47.

FORMULA

G.f.: (1/(1 - x)^2)*Sum_{k>=1} mu(k)*x^k/(1 - x^k)^2. - Ilya Gutkovskiy, Mar 16 2017

MATHEMATICA

Accumulate@Accumulate@EulerPhi@Range[0, 100] (* Vladimir Joseph Stephan Orlovsky, Apr 21 2011 *)

CROSSREFS

Cf. A005598.

Sequence in context: A209407 A124129 A101301 * A303853 A075321 A258030

Adjacent sequences:  A103113 A103114 A103115 * A103117 A103118 A103119

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 04 2007

STATUS

approved

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Last modified September 27 03:21 EDT 2020. Contains 337380 sequences. (Running on oeis4.)