pi(n), the number of primes <= n. Sometimes called PrimePi(n) to distinguish it from the number 3.14159...
A000720
pi(n), the number of primes <= n. Sometimes called PrimePi(n) to distinguish it from the number 3.14159...
Terms
- a(0) =0a(1) =1a(2) =2a(3) =2a(4) =3a(5) =3a(6) =4a(7) =4a(8) =4a(9) =4a(10) =5a(11) =5a(12) =6a(13) =6a(14) =6a(15) =6a(16) =7a(17) =7a(18) =8a(19) =8a(20) =8a(21) =8a(22) =9a(23) =9a(24) =9a(25) =9a(26) =9a(27) =9a(28) =10a(29) =10
External references
- oeis: A000720