Number of numbers k such that all terms of the Collatz (3x+1) iteration of k are <= 3^n.
A224540
Number of numbers k such that all terms of the Collatz (3x+1) iteration of k are <= 3^n.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =12a(4) =36a(5) =106a(6) =249a(7) =613a(8) =1732a(9) =8028a(10) =23348a(11) =69370a(12) =210807a(13) =634839a(14) =1893582a(15) =5686389a(16) =17031777a(17) =51073675a(18) =153185957a(19) =459516225a(20) =1378707224a(21) =4135278456
External references
- oeis: A224540