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

Terms

a(0) =1a(1) =7a(2) =9a(3) =15a(4) =19a(5) =21a(6) =25a(7) =27a(8) =37a(9) =39a(10) =49a(11) =55a(12) =61a(13) =69a(14) =79a(15) =81a(16) =85a(17) =87a(18) =91a(19) =97a(20) =105a(21) =115a(22) =117a(23) =129a(24) =139a(25) =141a(26) =145a(27) =147a(28) =151a(29) =157