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A239641 Dirichlet inverse of Carmichael lambda function (A002322). 1
1, -1, -2, -1, -4, 2, -6, 1, -2, 4, -10, 4, -12, 6, 12, -1, -16, 2, -18, 8, 18, 10, -22, -4, -4, 12, -2, 12, -28, -12, -30, -3, 30, 16, 36, 0, -36, 18, 36, -8, -40, -18, -42, 20, 4, 22, -46, 0, -6, 4, 48, 24, -52, 2, 60, -12, 54, 28, -58, -40, -60, 30, 18, -1, 84, -30, -66, 32, 66, -36, -70, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..1000

MATHEMATICA

inverse[F_][1] := 1/F[1]; inverse[F_][n_] := -1/F[1] Sum[F[n/Divisors[n][[i]]]*inverse[F][Divisors[n][[i]]], {i, Length[Divisors[n]] - 1}]; Table[inverse[CarmichaelLambda][n], {n, 1, 331}];

PROG

(PARI) seq(n)={dirdiv(vector(n, n, n==1), vector(n, n, lcm(znstar(n).cyc)))} \\ Andrew Howroyd, Aug 05 2018

CROSSREFS

Cf. A002322, A141258.

Sequence in context: A173557 A023900 A141564 * A249151 A046791 A187203

Adjacent sequences:  A239638 A239639 A239640 * A239642 A239643 A239644

KEYWORD

sign

AUTHOR

José María Grau Ribas, Mar 23 2014

STATUS

approved

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Last modified April 20 08:48 EDT 2019. Contains 322306 sequences. (Running on oeis4.)