Wagstaff numbers that are of the form 4*k + 3.

Terms

a(0) =3a(1) =7a(2) =11a(3) =19a(4) =23a(5) =31a(6) =43a(7) =79a(8) =127a(9) =167a(10) =191a(11) =199a(12) =347a(13) =3539a(14) =5807a(15) =10691a(16) =11279a(17) =12391a(18) =14479a(19) =83339a(20) =117239a(21) =127031a(22) =141079a(23) =269987a(24) =986191a(25) =4031399