Numbers k such that 2k+1, 4k+1, 6k+1 and 8k+1 are primes.

Terms

a(0) =165a(1) =765a(2) =1530a(3) =2130a(4) =2475a(5) =3420a(6) =5415a(7) =7695a(8) =9060a(9) =11505a(10) =12705a(11) =13020a(12) =15885a(13) =16650a(14) =20055a(15) =20745a(16) =22530a(17) =24915a(18) =26940a(19) =29670a(20) =32925a(21) =35070a(22) =36885a(23) =39270a(24) =44370a(25) =47730a(26) =48465a(27) =54735a(28) =55860a(29) =56310