Lower members of a "good pair" of the form (k, 2*k +- 1).

Terms

a(0) =1a(1) =7a(2) =11a(3) =31a(4) =41a(5) =49a(6) =109a(7) =127a(8) =139a(9) =143a(10) =151a(11) =173a(12) =179a(13) =203a(14) =217a(15) =397a(16) =491a(17) =511a(18) =521a(19) =539a(20) =547a(21) =589a(22) =599a(23) =683a(24) =749a(25) =803a(26) =929a(27) =989a(28) =2041a(29) =2047