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A164941 a(n) = Sum_{d|n} phi(n/d)^(d-1). 2
1, 2, 2, 3, 2, 5, 2, 5, 6, 7, 2, 17, 2, 9, 34, 15, 2, 45, 2, 87, 102, 13, 2, 191, 258, 15, 294, 289, 2, 1579, 2, 203, 1126, 19, 5394, 2577, 2, 21, 4242, 17227, 2, 16083, 2, 2037, 83282, 25, 2, 36107, 46658, 262423, 65794, 5839, 2, 139161, 1058578, 292455 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Seiichi Manyama, Table of n, a(n) for n = 1..5000

FORMULA

G.f.: Sum_{k>=1} x^k/(1-phi(k)*x^k).

CROSSREFS

Cf. A000010, A087909, A309369.

Sequence in context: A325250 A062830 A322366 * A328673 A115119 A066656

Adjacent sequences:  A164938 A164939 A164940 * A164942 A164943 A164944

KEYWORD

nonn

AUTHOR

Franklin T. Adams-Watters, Sep 01 2009

STATUS

approved

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Last modified November 19 06:34 EST 2019. Contains 329310 sequences. (Running on oeis4.)