In the '3x+1' problem, primes which as starting values set new records for number of steps to reach 1, where a step means either 'divide by two' or 'triple plus one and then divide by two'.
A244638
In the '3x+1' problem, primes which as starting values set new records for number of steps to reach 1, where a step means either 'divide by two' or 'triple plus one and then divide by two'.
Terms
- a(0) =2a(1) =3a(2) =7a(3) =19a(4) =31a(5) =41a(6) =73a(7) =97a(8) =193a(9) =257a(10) =313a(11) =487a(12) =859a(13) =937a(14) =1249a(15) =2539a(16) =3331a(17) =3947a(18) =5351a(19) =5839a(20) =7963a(21) =9257a(22) =12343a(23) =21943a(24) =31687a(25) =45127a(26) =60169a(27) =78791a(28) =115547a(29) =180463
External references
- oeis: A244638