a(n) is the number of numbers greater than 1 and up to prime(n)^2 whose prime factors are all less than or equal to prime(n).
A342163
a(n) is the number of numbers greater than 1 and up to prime(n)^2 whose prime factors are all less than or equal to prime(n).
Terms
- a(0) =2a(1) =6a(2) =15a(3) =29a(4) =60a(5) =87a(6) =137a(7) =176a(8) =247a(9) =360a(10) =422a(11) =568a(12) =689a(13) =776a(14) =923a(15) =1136a(16) =1369a(17) =1494a(18) =1764a(19) =1978a(20) =2128a(21) =2451a(22) =2710a(23) =3074a(24) =3562a(25) =3870a(26) =4077a(27) =4411a(28) =4638a(29) =4995
External references
- oeis: A342163