Numbers n such that phi(sigma(k))/sigma(phi(k)) < phi(sigma(n))/sigma(phi(n)) for all k < n and n is the smallest positive integer with this property.
A227927
Numbers n such that phi(sigma(k))/sigma(phi(k)) < phi(sigma(n))/sigma(phi(n)) for all k < n and n is the smallest positive integer with this property.
Terms
- a(0) =1a(1) =2a(2) =36a(3) =144a(4) =576a(5) =3600a(6) =14400a(7) =921600a(8) =1040400a(9) =4161600a(10) =8643600a(11) =34574400a(12) =266342400a(13) =700131600a(14) =2800526400a(15) =179233689600a(16) =202338032400a(17) =809352129600
External references
- oeis: A227927