n sets a record for the number of primes in {n, f(n), f(f(n)), ..., 1}, where f is the Collatz function defined by f(x) = x/2 if x is even; f(x) = 3x + 1 if x is odd.
A078373
n sets a record for the number of primes in {n, f(n), f(f(n)), ..., 1}, where f is the Collatz function defined by f(x) = x/2 if x is even; f(x) = 3x + 1 if x is odd.
Terms
- a(0) =2a(1) =3a(2) =7a(3) =19a(4) =27a(5) =97a(6) =171a(7) =231a(8) =487a(9) =763a(10) =1071a(11) =4011a(12) =6171a(13) =10971a(14) =17647a(15) =47059a(16) =99151a(17) =117511a(18) =202471a(19) =260847a(20) =481959a(21) =963919a(22) =1564063a(23) =1805311a(24) =1993215a(25) =6991599a(26) =8400511a(27) =11200681a(28) =36791535a(29) =46564287
External references
- oeis: A078373