a(n) = Sum_{k <= 10^n} cototient(k), where cototient is A051953.
A064016
a(n) = Sum_{k <= 10^n} cototient(k), where cototient is A051953.
Terms
- a(0) =0a(1) =23a(2) =2006a(3) =196308a(4) =19607514a(5) =1960399246a(6) =196036947608
External references
- oeis: A064016