A050391 Reversion of Euler totient function A000010.
1, -1, 0, 3, -8, 12, -6, -37, 208, -730, 1708, -1278, -10018, 56782, -163644, 229985, 389830, -3724538, 13460550, -28799694, 12470564, 205544596, -1084748334, 3195484242, -4851317704, -7421547798, 81343472008
Offset: 1
Keywords
Links
- N. J. A. Sloane, Transforms
- Index entries for reversions of series
Programs
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PARI
Vec(serreverse(sum(n=1, 50, moebius(n)*x^n/(1-x^n)^2 + O(x^50)))) \\ Michel Marcus, Sep 25 2017
Formula
G.f. A(x) satisfies: A(x) = x - Sum_{k>=2} phi(k) * A(x)^k. - Ilya Gutkovskiy, Apr 22 2020