Take a squarefree semiprime and take the difference of its prime factors. If it is a squarefree semiprime repeat the process. Sequence lists the squarefree semiprimes that generate other squarefree semiprimes only in the first k steps of this process. Case k = 4.
A296811
Take a squarefree semiprime and take the difference of its prime factors. If it is a squarefree semiprime repeat the process. Sequence lists the squarefree semiprimes that generate other squarefree semiprimes only in the first k steps of this process. Case k = 4.
Terms
- a(0) =687a(1) =1186a(2) =1631a(3) =1906a(4) =1994a(5) =2391a(6) =3107a(7) =3687a(8) =3755a(9) =4786a(10) =5991a(11) =6155a(12) =6218a(13) =7715a(14) =7967a(15) =8306a(16) =8327a(17) =8351a(18) =9298a(19) =9731a(20) =9995a(21) =11567a(22) =12178a(23) =12938a(24) =13391a(25) =13607a(26) =13787a(27) =13863a(28) =14367a(29) =15434
External references
- oeis: A296811