A094872 phi(n)/tau(n), for odd squarefree n > 1 (A056911), phi = A000010, tau = A000005.

1, 2, 3, 5, 6, 2, 8, 9, 3, 11, 14, 15, 5, 6, 18, 6, 20, 21, 23, 8, 26, 10, 9, 29, 30, 12, 33, 11, 35, 36, 15, 39, 41, 16, 14, 44, 18, 15, 18, 48, 50, 51, 6, 53, 54, 18, 56, 22, 24, 20, 63, 21, 65, 27, 68, 69, 23, 30, 28, 74, 75, 30, 78, 26, 33, 81, 10, 83, 86, 29, 89, 90, 30, 36, 40

Offset

1,2

Links

Ivan Neretin, Table of n, a(n) for n = 1..10000

Formula

a(n) = A000010(A056911(n+1)) / A000005(A056911(n+1)). - Altug Alkan, Oct 04 2017

Mathematica

EulerPhi[#]/DivisorSigma[0, #] & /@ Select[Range[3, 190, 2], SquareFreeQ] (* Ivan Neretin, Oct 04 2017 *)

Prog

(PARI) for(n=1, 95, if(issquarefree(k=2*n+1), print1(eulerphi(k)/numdiv(k), ", "))) \\ Klaus Brockhaus, Jun 16 2004

Crossrefs

Cf. A056911.

Sequence in context: A336017 A291486 A177870 * A361443 A201744 A349957

Adjacent sequences: A094869 A094870 A094871 * A094873 A094874 A094875

Keyword

nonn

Author

Lekraj Beedassy, Jun 16 2004

Extensions

Corrected and extended by Klaus Brockhaus, Jun 16 2004

a(16)=6 corrected by Ivan Neretin, Oct 04 2017

Status

approved