Numbers k such that 2*k+1, 4*k+1, 8*k+1 and 16*k+1 are primes.

Terms

a(0) =765a(1) =1065a(2) =1155a(3) =1530a(4) =3105a(5) =3420a(6) =3705a(7) =5160a(8) =6840a(9) =7695a(10) =8325a(11) =9060a(12) =11265a(13) =11505a(14) =12195a(15) =14835a(16) =15390a(17) =15885a(18) =16650a(19) =17655a(20) =20745a(21) =22185a(22) =23205a(23) =27300a(24) =28155a(25) =28995a(26) =30165a(27) =30690a(28) =33300a(29) =33825