a(n) = Sum_{k<=10^n} d(k)^2, where d(k) = number of divisors function A000005.
A386602
a(n) = Sum_{k<=10^n} d(k)^2, where d(k) = number of divisors function A000005.
Terms
- a(0) =1a(1) =83a(2) =3046a(3) =75083a(4) =1504136a(5) =26324772a(6) =421094344a(7) =6313765566a(8) =90150976452
External references
- oeis: A386602