Numbers k such that phi(sigma(k))/k < phi(sigma(m))/m for all m < k, where sigma is the sum of divisors function (A000203) and phi is Euler's totient function (A000010).
A293711
Numbers k such that phi(sigma(k))/k < phi(sigma(m))/m for all m < k, where sigma is the sum of divisors function (A000203) and phi is Euler's totient function (A000010).
Terms
- a(0) =1a(1) =3a(2) =5a(3) =11a(4) =17a(5) =23a(6) =29a(7) =59a(8) =89a(9) =149a(10) =179a(11) =239a(12) =269a(13) =359a(14) =377a(15) =389a(16) =419a(17) =839a(18) =1049a(19) =1259a(20) =1889a(21) =2099a(22) =2309a(23) =9239a(24) =11549a(25) =13859a(26) =20789a(27) =23099a(28) =25409a(29) =30029
External references
- oeis: A293711