Wagstaff numbers that are of the form 4*k + 1.

Terms

a(0) =5a(1) =13a(2) =17a(3) =61a(4) =101a(5) =313a(6) =701a(7) =1709a(8) =2617a(9) =10501a(10) =42737a(11) =95369a(12) =138937a(13) =267017a(14) =374321