Numbers n such that n, 2n+1, and 4n+3 all prime.

Terms

a(0) =2a(1) =5a(2) =11a(3) =41a(4) =89a(5) =179a(6) =359a(7) =509a(8) =719a(9) =1019a(10) =1031a(11) =1229a(12) =1409a(13) =1451a(14) =1481a(15) =1511a(16) =1811a(17) =1889a(18) =1901a(19) =1931a(20) =2459a(21) =2699a(22) =2819a(23) =3449a(24) =3491a(25) =3539a(26) =3821a(27) =3911a(28) =5081a(29) =5399