Examples
Explicit lists in the OEIS are J2 in A007434, J3 in A059376, J4 in A059377, J5 in A059378, J6 up to J10 in A069091 up to A069095.
Multiplicative functions defined by ratios are J2(n)/J1(n) in A001615, J3(n)/J1(n) in A160889, J4(n)/J1(n) in A160891, J5(n)/J1(n) in A160893, J6(n)/J1(n) in A160895, J7(n)/J1(n) in A160897, J8(n)/J1(n) in A160908, J9(n)/J1(n) in A160953, J10(n)/J1(n) in A160957, J11(n)/J1(n) in A160960.
Examples of the ratios J2k(n)/Jk(n) are J4(n)/J2(n) in A065958, J6(n)/J3(n) in A065959, and J8(n)/J4(n) in A065960.
Read more about this topic: Jordan's Totient Function
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