First noncomposite number reached when iterating the map x -> x', when starting from x = A351255(n). Here x' is the arithmetic derivative of x, A003415.
A351259
First noncomposite number reached when iterating the map x -> x', when starting from x = A351255(n). Here x' is the arithmetic derivative of x, A003415.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =5a(4) =5a(5) =7a(6) =5a(7) =7a(8) =31a(9) =7a(10) =41a(11) =71a(12) =191a(13) =2711a(14) =7a(15) =5a(16) =7a(17) =41a(18) =103a(19) =59a(20) =71a(21) =271a(22) =71a(23) =1031a(24) =2887a(25) =439a(26) =5a(27) =5a(28) =7a(29) =631
External references
- oeis: A351259