Numbers n such that phi(sigma(n))/n > phi(sigma(m))/m for all m < n, where sigma is the sum of divisors function (A000203) and phi is Euler's totient function (A000010).
A293708
Numbers n such that phi(sigma(n))/n > phi(sigma(m))/m for all m < n, where sigma is the sum of divisors function (A000203) and phi is Euler's totient function (A000010).
Terms
- a(0) =1a(1) =4a(2) =16a(3) =36a(4) =144a(5) =576a(6) =3600a(7) =14400a(8) =32400a(9) =129600a(10) =291600a(11) =1166400a(12) =8643600a(13) =34574400a(14) =77792400a(15) =84272400a(16) =311169600a(17) =337089600a(18) =700131600a(19) =2800526400a(20) =179233689600a(21) =202338032400a(22) =809352129600
External references
- oeis: A293708