Denominator of Sum_{k=1..n} phi(k)/k^4.
A072161
Denominator of Sum_{k=1..n} phi(k)/k^4.
Terms
- a(0) =1a(1) =16a(2) =1296a(3) =10368a(4) =6480000a(5) =6480000a(6) =15558480000a(7) =124467840000
External references
- oeis: A072161
A072161
Denominator of Sum_{k=1..n} phi(k)/k^4.