The smallest number k such that the equation phi(phi(x)) = k has exactly n solutions.
A378507
The smallest number k such that the equation phi(phi(x)) = k has exactly n solutions.
Terms
- a(0) =10a(1) =56a(2) =6a(3) =1a(4) =84a(5) =312a(6) =2a(7) =200a(8) =464a(9) =36a(10) =108a(11) =4a(12) =12a(13) =88a(14) =816a(15) =264a(16) =440a(17) =360a(18) =552a(19) =120a(20) =224a(21) =8a(22) =3696a(23) =1320a(24) =928a(25) =176a(26) =624a(27) =1472a(28) =832a(29) =5728
External references
- oeis: A378507