Numbers p such that p, 2p-1, 3p-2, 4p-3 are primes.

Terms

a(0) =331a(1) =1531a(2) =3061a(3) =4261a(4) =4951a(5) =6841a(6) =10831a(7) =15391a(8) =18121a(9) =23011a(10) =25411a(11) =26041a(12) =31771a(13) =33301a(14) =40111a(15) =41491a(16) =45061a(17) =49831a(18) =53881a(19) =59341a(20) =65851a(21) =70141a(22) =73771a(23) =78541a(24) =88741a(25) =95461a(26) =96931a(27) =109471a(28) =111721a(29) =112621