Home primes in base 2: primes reached when you start with n and (working in base 2) concatenate its prime factors (A048985); repeat until a prime is reached (or -1 if no prime is ever reached). Answer is written in base 10.
A048986
Home primes in base 2: primes reached when you start with n and (working in base 2) concatenate its prime factors (A048985); repeat until a prime is reached (or -1 if no prime is ever reached). Answer is written in base 10.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =31a(4) =5a(5) =11a(6) =7a(7) =179a(8) =29a(9) =31a(10) =11a(11) =43a(12) =13a(13) =23a(14) =29a(15) =12007a(16) =17a(17) =47a(18) =19a(19) =251a(20) =31a(21) =43a(22) =23a(23) =499a(24) =4091a(25) =4091a(26) =127a(27) =4091a(28) =29a(29) =127
External references
- oeis: A048986