Numbers k such that 7*k - 4 is prime.

Terms

a(0) =1a(1) =3a(2) =5a(3) =9a(4) =11a(5) =15a(6) =23a(7) =29a(8) =33a(9) =35a(10) =39a(11) =41a(12) =45a(13) =51a(14) =53a(15) =59a(16) =69a(17) =75a(18) =81a(19) =83a(20) =89a(21) =93a(22) =95a(23) =111a(24) =113a(25) =119a(26) =123a(27) =135a(28) =141a(29) =143