Integers n for which the ratio phi(n)/pi(n) is smaller than for any subsequent n. Here phi(n) is Euler's totient function and pi(n) is the number of primes that are at most n.
A080289
Integers n for which the ratio phi(n)/pi(n) is smaller than for any subsequent n. Here phi(n) is Euler's totient function and pi(n) is the number of primes that are at most n.
Terms
- a(0) =6a(1) =30a(2) =42a(3) =60a(4) =90a(5) =210a(6) =420a(7) =630a(8) =840a(9) =1050a(10) =2310a(11) =2730a(12) =3570a(13) =4620a(14) =5460a(15) =6930a(16) =9240a(17) =11550a(18) =13860a(19) =30030a(20) =39270a(21) =43890a(22) =60060a(23) =90090a(24) =120120a(25) =150150a(26) =180180a(27) =210210a(28) =240240a(29) =510510
External references
- oeis: A080289