Denominator of Sum_{k=1..n} phi(k)/k^3.
A072159
Denominator of Sum_{k=1..n} phi(k)/k^3.
Terms
- a(0) =1a(1) =8a(2) =216a(3) =864a(4) =108000a(5) =12000a(6) =4116000a(7) =16464000a(8) =1333584000a(9) =1333584000
External references
- oeis: A072159
A072159
Denominator of Sum_{k=1..n} phi(k)/k^3.