Numbers k such that the set of prime factors of phi(k) is a proper subset of the set of prime factors of k and the set of prime factors of k is a proper subset of the set of prime factors of sigma(k).
A141717
Numbers k such that the set of prime factors of phi(k) is a proper subset of the set of prime factors of k and the set of prime factors of k is a proper subset of the set of prime factors of sigma(k).
Terms
- a(0) =24a(1) =40a(2) =96a(3) =234a(4) =360a(5) =384a(6) =540a(7) =600a(8) =640a(9) =936a(10) =1536a(11) =1920a(12) =2016a(13) =2160a(14) =2176a(15) =3000a(16) =3240a(17) =3402a(18) =3744a(19) =4320a(20) =4680a(21) =5760a(22) =6048a(23) =6144a(24) =6318a(25) =6528a(26) =6552a(27) =8640a(28) =9600a(29) =9720
External references
- oeis: A141717