Sum_{k <= 10^n} number of distinct primes dividing k (A001221).

A064182

Sum_{k <= 10^n} number of distinct primes dividing k (A001221).

Terms

    a(0) =0a(1) =11a(2) =171a(3) =2126a(4) =24300a(5) =266400a(6) =2853708a(7) =30130317a(8) =315037281a(9) =3271067968a(10) =33787242719a(11) =347589015681

External references