This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A094872 phi(n)/tau(n), for odd squarefree n > 1 (A056911), phi = A000010, tau = A000005. 1
 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 (list; graph; refs; listen; history; text; internal format)
 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: A157260 A291486 A177870 * A201744 A152206 A154123 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified March 18 13:47 EDT 2019. Contains 321289 sequences. (Running on oeis4.)