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

Terms

a(0) =1a(1) =13a(2) =23a(3) =61a(4) =83a(5) =97a(6) =217a(7) =253a(8) =277a(9) =287a(10) =301a(11) =347a(12) =359a(13) =407a(14) =433a(15) =793a(16) =983a(17) =1021a(18) =1043a(19) =1079a(20) =1093a(21) =1177a(22) =1199a(23) =1367a(24) =1499a(25) =1607a(26) =1859a(27) =1979a(28) =4081a(29) =4093