Duplicate of A056215.

Terms

a(0) =281a(1) =521a(2) =1031a(3) =1951a(4) =2281a(5) =2311a(6) =2591a(7) =3671a(8) =5471a(9) =5711a(10) =6791a(11) =7481a(12) =8111a(13) =8681