The smallest k such that the number of steps in the n Collatz sequences starting at k+i, i=0..n-1, is always prime.
A174538
The smallest k such that the number of steps in the n Collatz sequences starting at k+i, i=0..n-1, is always prime.
Terms
- a(0) =3a(1) =3a(2) =3a(3) =60a(4) =246a(5) =560a(6) =560a(7) =560a(8) =4722a(9) =4722a(10) =6032a(11) =6666a(12) =13956a(13) =13956a(14) =13956a(15) =13956a(16) =13956a(17) =13956a(18) =13956a(19) =13956a(20) =13956a(21) =13956a(22) =13956a(23) =13956a(24) =81488a(25) =81488a(26) =81488a(27) =83840a(28) =89535a(29) =89535
External references
- oeis: A174538