Number of steps to reach a prime under "replace n with concatenation of its prime factors" when applied to n-th composite number, or -1 if no such number exists.
A037271
Number of steps to reach a prime under "replace n with concatenation of its prime factors" when applied to n-th composite number, or -1 if no such number exists.
Terms
- a(0) =2a(1) =1a(2) =13a(3) =2a(4) =4a(5) =1a(6) =5a(7) =4a(8) =4a(9) =1a(10) =15a(11) =1a(12) =1a(13) =2a(14) =3a(15) =4a(16) =4a(17) =1a(18) =2a(19) =2a(20) =1a(21) =5a(22) =3a(23) =2a(24) =2a(25) =1a(26) =9a(27) =2a(28) =9a(29) =6
External references
- oeis: A037271