First column of array in A081998.

Terms

a(0) =1a(1) =3a(2) =4a(3) =17a(4) =19a(5) =49a(6) =53a(7) =103a(8) =107a(9) =179a(10) =181a(11) =293a(12) =295a(13) =421a(14) =431a(15) =559a(16) =563a(17) =709a(18) =713a(19) =911a(20) =913a(21) =1151a(22) =1153a(23) =1423a(24) =1427a(25) =1681a(26) =1693a(27) =2063a(28) =2069a(29) =2383