Array: each row starts with the least prime not in a previous row, and each prime p in a row is followed by the greatest prime < 3*p.
A229609
Array: each row starts with the least prime not in a previous row, and each prime p in a row is followed by the greatest prime < 3*p.
Terms
- a(0) =2a(1) =5a(2) =3a(3) =13a(4) =7a(5) =11a(6) =37a(7) =19a(8) =31a(9) =17a(10) =109a(11) =53a(12) =89a(13) =47a(14) =23a(15) =317a(16) =157a(17) =263a(18) =139a(19) =67a(20) =29a(21) =947a(22) =467a(23) =787a(24) =409a(25) =199a(26) =83a(27) =41a(28) =2837a(29) =1399
External references
- oeis: A229609